Ocos Geodes
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Many names have been given to geodes throughout the
world, but none so fitting as the Ocos Geode (some say
these are named for their source, the Orinoco River in Brazil,
others believe it came from the Portuguese word for
"hollow," you decide...)
Ocos formed some 130 million years ago in
basalt amygdules (a formerly open vesicle which has been
filled with a secondary mineral(s) precipitated from low temp
ground waters which penetrated into the rock). Over the
years the basalts have been weathered away and left behind
small geodes in what is now called cascalho, a dark reddish
brown soil in the Serra Geral Formation.
Ocos are mainly found in the 3000 ft elevations of the Tres
Pinheiros (Three Pines) region.  The geodes are normally
removed from the basalt by hand (which can be difficult
because their skin or outer shell of chalcedony is relatively
thin and often rope-like in formation). The Ocos are then
taken back down the steep mountains in burlap sacks or
buckets on horseback or by pack mules to the town of
Soledade to be cut and polished.
Thin shell Ocos called "casa fina" command a higher price,
but display less of the famous wavy or flame like patterns on
the rim. Ocos size is usually small (1-3 inches)
When cut, Ocos display brilliant drusy quartz linings on tan,
grey, brown or black shells with white waves or flames. Many
Ocos have inclusions in the quartz, rarely amethyst.

Ocos
Geodes

aka

Ochos
Occos
Item # 1-OGP09190021
Polished Large Ocos Geode
with Lid

$28.00
This Large Ocos Geode has beautiful
black, white and clear swirls on the polished
edges with well formed clear quartz crystals
with black inclusions inside. The outside
has the classic "rope" like design. This
piece has been in our personal collection
since 2005
This pair weighs 5.1 oz or 0.32 lb (145g)
and measures
2.8 x 2.4 x 1.8 inches (7.1 x 6.1 x 4.5 cm)
Item # A-OG10200050
Polished Ocos Geode

$10.00
Grey, white  and well formed Amethyst quartz crystals
in the vug.
Geode weighs 8g
Black, maroon, white, grey and clear wisps on the
polished edge with well formed quartz crystals
Geode weighs 8.5g
Tan, mahogany black and white swirls and wisps on the
polished edge with well formed quartz crystals in the
maroon vug
Geode weighs 13g
Tan, red, white and clear wisps on the polished edge
with well formed quartz crystal tower in the vug.
Geode weighs 5.5g
Item # B-OG10200050
Polished Ocos Geode

$10.00
Item # C-OG10200050
Polished Ocos Geode

$10.00
Item # E-OG10200050
Polished Ocos Geode

$10.00
Item # D-OG10200050
Polished Ocos Geode

$10.00
Grey, white and clear wisps on the polished edge with
well formed quartz crystals in the vug.
Geode weighs 10g
Item # F-OG10200050
Polished Ocos Geode

$10.00
Grey, white, tan and clear scallops on the polished
edge with well formed druzy quartz crystals with
touches of Goethite in the vug.
Geode weighs 10.5g
Item # G-OG10200050
Polished Ocos Geode

$10.00
Tan, white, brown and clear wisps on the polished edge
with well formed quartz crystals in the vug.
Geode weighs 12g
Item # H-OG10200050
Polished Ocos Geode

$10.00
Grey, white, black, brown and clear wisps on the
polished edge with well formed quartz crystals in the vug.
Geode weighs 13.5g
Item # I-OG10200050
Polished Ocos Geode

$10.00
Black, grey, white and clear wisps on the polished edge
with rolling mounds of fine quartz crystals and a single
stalactite in the vug.
Geode weighs 4g
Item # J-OG10200050
Polished Ocos Geode

$10.00
Black, grey, white and clear wisps on the polished edge
with well formed quartz crystals in the vug.
Geode weighs 8.5g
Item # K-OG10200050
Polished Ocos Geode

$10.00
Black grey, white, tan and clear wisps on the polished
edge with druzy quartz crystals in the vug.
Geode weighs 10.5g
Item # L-OG10200050
Polished Ocos Geode

$10.00
Tan, white and clear wisps on the polished edge with
well formed quartz crystals in the vug.
Geode weighs 7g
Item # M-OG10200050
Polished Ocos Geode

$10.00
Grey, tan, red, white and clear swirls on the polished
edge with well formed quartz crystals in the vug.
Geode weighs 7.5g
Item # N-OG10200050
Polished Ocos Geode

$10.00
Grey, white, red and clear on the polished edge with
well formed quartz crystals and a single larger crystal
in the vug.
Geode weighs 7.5g
Item # O-OG10200050
Polished Ocos Geode

$10.00
Grey, white, tan and clear wisps on the polished edge
with well formed quartz crystals in the vug.
Geode weighs 7g
Item # P-OG10200050
Polished Ocos Geode

$10.00
Tan, white, pink and clear wisps on the polished edge
with well formed quartz crystals with 2 spots of goethite
in the vug.
Geode weighs 8.5g
Item # Q-OG10200050
Polished Ocos Geode

$10.00
Black, grey, white and clear wisps on the polished edge
with well formed quartz crystals in the vug.
Geode weighs 9g
Item # R-OG10200050
Polished Ocos Geode

$10.00
Tan, white, red and clear waves on the polished edge
with well formed quartz crystals in the vug.
Geode weighs 7g
Shipping

These specimens ship Priority Mail padded flat rate
envelope or small flat rate box for a shipping cost in
the USA of $10.70.
The cost to ship up to 4 of these will not increase the
cost of shipping over purchasing 1 item
These Ocos Geodes are mounted with Geo-Tac in a Thumbnail Display Box
which has internal dimensions of 1" x 1"

The specimen can be easily removed if you desire.

Each has an Identification label with the name, locale and weight in grams