Hematite is an iron oxide mineral. Most iron ore deposits consist mainly of hematite, magnetite, or both. Hematite gets its name from the Greek word for blood (haimo) because of the color of its powder and the red streak it leaves when scratched across a piece of unglazed porcelain. Hematite is black, but when powdered or fragmented can show colors ranging from ochre red to jet black. Hematite crystals are a silvery, shiny opaque gemstone that almost looks like metal. Hematite specimens are normally an opaque mineral with a dull luster and it is also known as "black diamond". Historically it was used in the making and coloration of pottery. It was also made into a paste from which beads were made and hardened, and appears commonly today as black beads in costume jewelry. Hematite is an iron ore that is very popular in bead and jewelry designs. Nearly all Hematite beads on the market are manmade materials.
Hematite and magnetite concretions or nodules, sometimes called ironstone concretions, are often mistaken for meteorites because their unusual shapes catch people's attention and they are denser than most other rocks. Hematite concretions are formed in sedimentary rocks by oxidation of pyrite or marcasite (iron sulfide) crystals or precipitation of iron oxide from iron rich solutions. Concretions come in a wide variety of unusual shapes. Sometimes they're shiny on the surface, which might give the impression of a meteorite fusion crust.
While the forms of hematite vary, they all have a rust-red streak. Hematite is harder than pure iron, but much more brittle. Huge deposits of hematite are found in banded iron formations. Grey hematite is typically found in places where there has been standing water or mineral hot springs, such as those in Yellowstone. The mineral can precipitate out of water and collect in layers at the bottom of a lake, spring, or other standing water. But hematite can also occur without water, as the result of volcanic activity.
Hematite appears in many forms in nature, such as Kidney Ore, a bumpy ore that has an appearance likened to a kidney; Hematite Rose, a formation with crystals in the shape of petals; Tiger Iron, a sedimentary rock with Hematite mixed into its multiple layers; Oolitic, sedimentary deposits of small, circular Hematite grains; and Micaceous Hematite, a scaly, shiny stone valued for decorative uses. Its soft Earthy, form is called Red Ochre. Hematite often appears within other crystals such as Aventurine or as phantom crystals.
Hematite on Mars
Hematite has even been detected on Mars. In 1998 the Mars Global Surveyor (MGS) spacecraft found a large deposit of hematite near the equator of Mars. "We believe that the gray hematite is very strong evidence that water was once present in that area," said Victoria Hamilton, a planetary geologist at Arizona State University (ASU). She went on to say, "we think the deposit is fairly old. It was buried, perhaps, for several hundred million years or more and now it's being exposed by wind erosion. Water is essential to life as we know it and this finding bolsters the theory that life may have existed on Mars".
4 Piece Polished Hematite Set$29.00 Add to cart
AAA Rare Stella Beam Hematite Crystals and Hausmannite from South Africa$45.00 Add to cart
AAA Rare Stella Beam Hematite Crystals and Hausmannite from South Africa$54.00 Add to cart
Hematite Crystals on quartz matrix from South Africa$25.00 Add to cart
Hematite from Wessels Mine, Kalahari manganese fields, Northern Cape Province, South Africa.$45.00 Add to cart
Large Hematite Crystal with secondary crystal growth Wessels Mine, Northern Cape, South Africa$42.00 Add to cart
Micro Mount Hematite Crystal Wessels Mine, Hotazel, Kalahari manganese fields, South Africa$21.00 Add to cart
Rare Stella Beam Hematite Crystals and Hausmannite from South Africa$39.00 Add to cart
Rare Stella Beam Hematite Crystals and Hausmannite from South Africa$36.00 Add to cart
Hematite Crystals Ste Marie Aux Mines Haut Rhin France
Rare Hematite Crystals Ste Marie Aux Mines Haut Rhin France
This very rare specimen is from Ste Marie Aux Mines in Haut Rhin, France and has excellent crystal formations and a stunning display pattern from a classic locale
This stunning specimen weighs 2.26 oz (64g) and measures 1.6 x 1.5 x 0.6 inches (42 x 38 x 15mm)
Micro Mount Hematite Crystal Wessels Mine, Hotazel, Kalahari manganese fields, South Africa
Very Nice A Grade Micro Mount Specimen with excellent specular reflection. This is from the Wessels Mine, Hotazel, Kalahari manganese fields, South Africa.
This specimen weighs 5.2g and measures 16 x 14 x 10 mm
Hematite from Monte Calvario, Biancavilla, Etna Volcanic Complex, Catania Province, Sicily, Italy
Very rare and world class specimen from a highly prized locale. Thin crystals of layered metallic hematite fully crystallized on front and rear. The crystals have mirror-like surface luster.
This piece weighs 0.04 oz (12.5g) and measures 2.3 x 0.65 x 0.21" (58.4 x 16.6 x 5.4mm)