Corundum is a crystalline form of aluminium oxide, with impurities or trace elements such as iron, titanium, or chromium. These impurities are what create the wide range of colors to be found in corundum crystals: grays, browns, yellows, greens, blues, purples, reds and pinks. It is a naturally transparent material, but can have different colors when impurities are present. Transparent specimens are used as gems. Corundum is best known for its gem varieties, Ruby and Sapphire. A corundum crystal that is red is called a ruby. All other colors are called sapphires. Sapphires that are not gem variety are simply referred to as corundums. The name "corundum" is derived from the Tamil word (from India) Kurundam which originates from the Sanskrit word Kuruvinda meaning ruby.

Corundum is a very hard, tough, and stable mineral. It is the second hardest mineral after Diamond. It is unaffected by acids and most environments. Translucent brown and emery are the most common forms of corundum, and due to their hardness and availability are used as abrasives. The term "emery" such as “emery cloth” comes from the corundum variety “Emery” which is mined specifically for its use as an abrasive. Erosion may cause Emery to crumble and form what is called "black sand." The most common varieties of corundum Emery - Black, massive variety of Corundum, with color from Magnetite, Hematite, and Spinel. Padparadschah - Orange-pink gem variety of Sapphire (A very rare and sought after variety) Ruby - Red variety of Corundum Sapphire - Refers to all gem varieties of Corundum, except the red variety Star Ruby - Ruby displaying asterism in the form of a six-rayed star. Star Sapphire – a Sapphire displaying asterism in the form of a six-rayed star.

Corundums are found in Burma (Myanmar), Sri Lanka, (The finest and largest crystallized specimens of gem- quality Sapphire are from Sri Lanka) Thailand, Vietnam , Afghanistan, India, Africa, Madagascar, Tanzania and Canada. In the U.S.A. they are found in Montana, California, North Carolina, New York, and Massachusetts. A well-known Ruby locality is the Cowee Creek District, Macon Co., North Carolina, especially the area of Franklin. Large deposits of Emery were found in New York and Massachusetts. Common Minerals found with Corundum are Calcite, Albite, Muscovite, Spinel, Almandine, Kyanite Corundum can be confused with many minerals, particularly the silicates, but the high hardness and specific gravity of Corundum can easily distinguish it from any mineral. Some corundums are SW Fluorescent.

Ref.

www.minerals.net/mineral/corundum.aspx

en.wikipedia.org/wiki/Corundum,

www.mindat.org/min-1136.html,

www.gemsociety.org/article/distinguishing-rubies-pink-sapphires/

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Item # 1CRNDS01174754

High Grade Rare Ruby Pink Fluorescent Sapphire from India

$95.00

Here's an excellent multi crystal mass formation of one of the most fluorescent types of Ruby/Sapphire Crystal Clusters ever found in India. Purple Pink sapphire in matrix. Sapphire has strong SW fluorescent red glow.

specimen weighs 7.8 oz or 0.49 lbs (222g) and measures 3.4 x 1.8 x 1.2 inches (8.6 x 4.7 x 3.2cm)

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Item # 2CRNDS01179927

High Grade Rare Ruby Pink Fluorescent Sapphire from India

$199.00

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Here's an excellent multi crystal mass formation of one of the most fluorescent types of Ruby/Sapphire Crystal Clusters ever found in India. Purple Pink sapphire in matrix. Sapphire has strong SW fluorescent red glow.

specimen weighs 21 oz or 1.31 lbs (597g) and measures 4.1 x 2.8 x 2.2 inches (10.6 x 7.2 x 5.7cm)

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Item # RUBZ01176495

Ruby in Zoisite aka Anyolite from Africa

$120.00

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Ruby in Zoisite, also called Anyolite, is a combination crystal that contains both the properties of fiery Ruby and earthy Zoisite. A metamorphic rock known as anyolite consists of green zoisite with black tschermakite and red ruby crystals.

specimen weighs 17.3 oz or 1.08 lbs (490g) and measures 4.3 x 2.6 x 2 inches (7.7 x 6.7 x 5.2cm)

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Propst Farm Corundums Lincoln County, North Carolina

For many decades the Propst Farm has been a source of large euhedral corundum (Sapphire) crystals in various colors, including red, pink and deep blue. These colors are often all mixed in the same crystal. The specimens found here are hexagonal form with flat basal pinacoid terminations and textured surfaces composed of many microscopic crystal faces which are beautiful when magnified under light. Corundum was first discovered here as loose crystals in plowed fields and gardens.

When the Propst family stopped farming the land, they began to allow rock hounds to access the fields and adjacent forest to collect for a small fee. Even after Mrs. Propst, became a widow she continued to allow rock hounding on her property. Due to an incident with an individual rockhound club member she banned that individual and also all clubs for a while. She did not like having large groups show up all at once. Mrs. Propst finally allowed individuals and small groups to access the property for a fee of $5 per person

Sadly, Helen Propst passed in December of 2015 and for a while the farm was closed until the estate was settled. Luckily for us rockhounds the farm is once again open for collecting. It is now owned by Ronald Lineberger who allows digging for a fee of $25 per person per day. The farm is on the Startown Road, south of Conover, Lincoln County, North Carolina. The address given by Ryan and Kate Lineberger is 3668 Startown Road Maiden, NC. The Propst Farm also now has a Facebook Page. https:///nas/content/live/spiritrockwebs/www.facebook.com/groups/propstfarm

The corundums are normally found between 4 and 8 feet down. You will have to remove lots of red dirt and sometimes a greyish-yellow layer close to the corundums. It is hard work and very hot and humid during most of the summer access times. There also may be an abundance of snakes, especially in the springtime. If it is rainy plan to spend lots of time removing water from your dig site. We understand that now if you wish to collect here you must put your fee in the bin in the shed before proceeding to dig. Please be respectful and do not bother the owners (Ronalds house is right next door) and clean up your trash before you leave. Camping is not permitted on site. The approved dig area is easy to see.

Notice effective April 11, 2020

"I have decided to close Propst Farm for digging until further notice. Some do not want to follow the rules and think they control where digging is allowed. After I have time to re-evaluate I may open again. If you had planned to come dig, I am sorry but for now it is not allowed. I appreciate everyone’s patience. To all who have visited and collected some of these great specimens, thank you for your visits. I have been blessed to meet you." Ronald Lineberger Member of Propst Farm since January 1, 2016

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Item # 6PFCOR04200001

Corundum from Propst Farm Lincoln County NC

$45.00

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A nice hexagonal Sapphire Corundum Crystal with flat basal pinacoid terminations and textured surfaces composed of many microscopic crystal faces which are beautiful when magnified under light. This piece shows pink and blue coloring. This piece was collected over 20 years ago

specimen weighs 3 oz or 0.18 lbs (85g) and measures 1.65 x 1.3 x 1 inches (4.2 x 3.3 x 2.7 cm)

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Item # 7PFCOR04200001

Corundum from Propst Farm Lincoln County NC

$49.00

A flattened hexagonal Sapphire Corundum Crystal with flat basal pinacoid terminations and textured surfaces composed of many microscopic crystal faces which are beautiful when magnified under light. This piece shows pink and blue coloring. This piece was collected over 20 years ago

specimen weighs 2.68 oz or 0.16 lbs (76g) and measures 1.66 x 1.5 x 0.77 inches (4.2 x 3.8 x 1.9 cm)

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Corundum from Propst Farm Lincoln County NC (1)
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Corundum Corundum Corundum from Propst Farm Lincoln County NC (1) Corundum
Item # 8PFCOR04200001

Corundum from Propst Farm Lincoln County NC

$45.00

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A nice hexagonal Sapphire Corundum Crystal with flat basal pinacoid terminations and textured surfaces composed of many microscopic crystal faces which are beautiful when magnified under light. This piece shows pink and blue coloring. This piece was collected over 20 years ago

specimen weighs 1.78 oz or 0.11 lbs (51g) and measures 1.64 x 1 x 0.7 inches (4.1 x 2.5 x 1.8 cm)

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Item # 9PFCOR04200001

Corundum from Propst Farm Lincoln County NC

$23.00

A nice hexagonal Sapphire Corundum Crystal with flat basal pinacoid terminations and textured surfaces composed of many microscopic crystal faces which are beautiful when magnified under light. This piece shows pink and blue coloring. This piece was collected over 20 years ago

specimen weighs 1.34 oz (38g) and measures 1.1 x 0.95 x 0.83 inches (2.8 x 2.4 x 2.1 cm)

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Item # 10PFCOR04200001

Corundum from Propst Farm Lincoln County NC

$18.00

A nice hexagonal Sapphire Corundum Crystal with flat basal pinacoid terminations and textured surfaces composed of many microscopic crystal faces which are beautiful when magnified under light. This piece shows pink and blue coloring. This piece was collected over 20 years ago

specimen weighs 1 oz (31g) and measures 1.1 x 1 x 0.74 inches (2.9 x 2.6 x 1.8 cm)

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Item # 11PFCOR04200001

Corundum from Propst Farm Lincoln County NC

$20.00

A nice hexagonal Sapphire Corundum Crystal with flat basal pinacoid terminations and textured surfaces composed of many microscopic crystal faces which are beautiful when magnified under light. This piece shows pink and blue coloring. This piece was collected over 20 years ago

specimen weighs 0.86 oz (24.5g) and measures 1.1 x 0.84 x 0.62 inches (2.8 x 2.1 x 1.5 cm)

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Item # 12PFCOR04200001

Corundum from Propst Farm Lincoln County NC

 $39.00

A nice hexagonal Sapphire Corundum Crystal with flat basal pinacoid terminations and textured surfaces composed of many microscopic crystal faces which are beautiful when magnified under light. This piece shows mostly pink with blue coloring. This piece was collected over 20 years ago

specimen weighs 1.24 oz (35g) and measures 1.1 x 0.95 x 0.76 inches (2.9 x 2.4 x 1.9 cm)

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Item # 13PFCOR04200001

Corundum from Propst Farm Lincoln County NC

$20.00

A nice hexagonal Sapphire Corundum Crystal with flat basal pinacoid terminations and textured surfaces composed of many microscopic crystal faces which are beautiful when magnified under light. This piece shows pink and blue coloring. This piece was collected over 20 years ago

specimen weighs 0.9 oz (26g) and measures 1.38 x 0.73 x 0.55 inches (3.5 x 1.8 x 1.4 cm)

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Item # 14PFCOR04200001

Corundum from Propst Farm Lincoln County NC

 $20.00

A nice hexagonal Sapphire Corundum Crystal with flat basal pinacoid terminations and textured surfaces composed of many microscopic crystal faces which are beautiful when magnified under light. This piece shows pink and blue coloring. This piece was collected over 20 years ago

specimen weighs 0.9 oz (26g) and measures 1 x 0.93 x 0.67 inches (2.5 x 2.3 x 1.7 cm)

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Item # 15PFCOR04200001

Corundum from Propst Farm Lincoln County NC

$32.00

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A nice hexagonal Sapphire Corundum Crystal cluster with flat basal pinacoid terminations and textured surfaces composed of many microscopic crystal faces which are beautiful when magnified under light. This piece has at least six small intertwined crystals that show pink and blue coloring. This piece was collected over 20 years ago

specimen weighs 0.76 oz (22g) and measures 1.2 x 1 x 0.84 inches (3 x 2.5 x 2.1 cm)

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Item # 16PFCOR04200050

Corundum from Propst Farm Lincoln County NC

$15.00

A nice hexagonal Sapphire Corundum Crystal with flat basal pinacoid terminations and textured surfaces composed of many microscopic crystal faces which are beautiful when magnified under light. This piece shows pink and blue coloring. This piece was collected over 20 years ago

specimen weighs 0.44 oz (13g) and measures 1 x 0.6 x 0.46 inches (2.7 x 1.5 x 1.1 cm)

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Item # 17PFCOR04200050

Corundum from Propst Farm Lincoln County NC

$15.00

A nice hexagonal Sapphire Corundum Crystal with flat basal pinacoid terminations and textured surfaces composed of many microscopic crystal faces which are beautiful when magnified under light. It has 2 smaller pieces intergrown into it. This piece shows pink and blue coloring. This piece was collected over 20 years ago

specimen weighs 13g and measures 0.8 x 0.49 x 0.39 inches (2 x 1.2 x 1 cm)

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Item # 18PFCOR04200050

Corundum from Propst Farm Lincoln County NC

$20.00

Three hexagonal Sapphire Corundum Crystals with flat basal pinacoid terminations intergrown in a cluster. This piece shows pink and blue coloring. This piece was collected over 20 years ago

specimen weighs 8g and measures 0.8 x 0.58 x 0.54 inches (2 x 1.4 x 1.3 cm)

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Item # 19PFCOR04200050

Corundum from Propst Farm Lincoln County NC

$10.00

A nice hexagonal Sapphire Corundum Crystal with flat basal pinacoid terminations and textured surfaces composed of many microscopic crystal faces which are beautiful when magnified under light. This piece shows pink and blue coloring. This piece was collected over 20 years ago

specimen weighs 15g and measures 1 x 0.78 x 0.64 inches (2.6 x 1.9 x 1.6 cm)

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Item # 20TNPFCOR04200060

Corundum from Propst Farm Lincoln County NC

$15.00

A nice Thumbnail hexagonal Sapphire Corundum Crystal with flat basal pinacoid termination This piece shows pink and blue coloring. This piece was collected over 20 years ago

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Item # 21TNPFCOR04200060

Corundum from Propst Farm Lincoln County NC

$15.00

A nice Thumbnail hexagonal Sapphire Corundum Crystal with flat basal pinacoid termination This piece shows pink and blue coloring. This piece was collected over 20 years ago

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Item # 22TNPFCOR04200060

Corundum from Propst Farm Lincoln County NC

$15.00

A nice Thumbnail hexagonal Sapphire Corundum Crystal with flat basal pinacoid termination This piece shows pink and blue coloring. This piece was collected over 20 years ago

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Item # 23TNPFCOR04200060

Corundum from Propst Farm Lincoln County NC

$15.00

A nice Thumbnail hexagonal Sapphire Corundum Crystal with flat basal pinacoid termination This piece shows pink and blue coloring. This piece was collected over 20 years ago

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Item # 24TVCOR04200002

Corundum Crystal from Transvaal, Africa

$59.00

A rare hexagonal Sapphire Corundum Crystal from Transvaal with flat basal pinacoid terminations and textured surfaces composed of many microscopic crystal faces. Transvaal was a province of South Africa from 1910 until 1994, when a new constitution subdivided it following the end of apartheid. The name "Transvaal" refers to the province's geographical location being the lands north of the Vaal River. Its capital was Pretoria, which was also the country's executive capital. This specimen was collected about 70 years ago by Kenhelm W. Stott Jr. on one of his African Safaris in 1948 or 1949. We procured this from him in February of 1990 and it has been in our personal collection since then..

specimen weighs 1.5 oz (13g) and measures 1.93 x 0.82 x 0.64 inches (4.9 x 2.1 x 1.6 cm)