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12459:
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Calcite (variety Sand Calcite)
Badlands, Pennington County, South Dakota
6.7 x 5.0 x 3.3 cm (2.6 x 2.0 x 1.3 inches)
Specimen status: Sold
Sand calcites occur when calcite crystals
include sand as they grow. This particular example, from the classic
sand calcite locality, has the typical sandy surface texture and is
undamaged. Look a bit like an overfed airplane.
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12489:
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Copper
Itauz Mine, Karagandy Province, Kazakhstan
3.6 x 2.4 x 0.5 cm (1.4 x 1.0 x 0.2 inches)
Specimen status: Sold
A cluster of dark to coppery copper
crystals, with very distinct crystals, including numerous spinel-law
twins (such as the spine). Other spots are combinations of cubic and
dodecahedral forms. No damage. The Itauz Mine has produced some of the
mineralogical world's finest crystalline copper specimens, and this is
a great little example.
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12530:
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Gypsum and Proustite - $30
Platosa Mine, Bermejillo, Durango, Mexico
6.0 x 1.2 x 0.5 cm (2.4 x 0.5 x 0.2 inches)
Specimen status: Available Click
here to order
A mostly transparent gypsum cleavage
fragment, dark along the edges due to mixed sulfides. Included along
the edges are a few deep ruby red proustite crystal fragments, which
reach a few mm in length. Notable for the unusual association.
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12532:
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Scheelite, Albite, and Muscovite
Mt Xuebaoding, Pingwu County, Mianyang Prefecture,
Sichuan Province, China
4.7 x 3.1 x 2.9 cm (1.9 x 1.2 x 1.1 inches)
Specimen status: Sold
A sharp and translucent brown scheelite
crystal sits on a bed of small, silvery muscovite crystals. Also
present is a blocky, translucent white albite crystal. The scheelite is
complete and 1.7 cm across at the largest point. The albite cluster is
4.2 cm along its largest dimension, complete on the front, but cleaved
along the back. When the specimen is exposed to longwave UV light the
albite exhibits a pinkish fluorescence, whereas under shortwave UV the
scheelite glows blue-white. The muscovite is mushed in a few spots (as
is typical for specimens from this locality) and the scheelite has a
few tiny dings, but overall the specimen has no major damage.
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13354:
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Spodumene (variety Kunzite)
Big Kahuna Zone, Oceanview Mine, Pala District, San
Diego County,
California
4.1 x 2.6 x 0.6 cm (1.6 x 1.0 x 0.2 inches)
Specimen status: Sold
Here we have a glassy, highly transparent
kunzite crystal shard. The color is light when viewed as shown in the
first three photos, but (as is common for kunzite) much more intense
when viewed along the c-axis (fourth picture). This is not a complete
crystal, although one of the two large faces and perhaps one of the
edges is natural. There is also some etching, which is common with gem
spodumene. Starting about two years ago, the Big Kahuna Zone of the
Oceanview Mine has been yielding the best kunzite to come from southern
California pegmatites since the 1950's.
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13360:
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Spodumene (variety Kunzite) - $40
Big Kahuna Zone, Oceanview Mine, Pala District, San
Diego County,
California
4.7 x 2.3 x 1.1 cm (1.9 x 0.9 x 0.4 inches)
Specimen status: Available Click
here to order
Here we have a
glassy, highly
transparent kunzite crystal shard. The color is light when viewed as
shown in the first three photos, but (as is common for kunzite) much
more intense when viewed along the c-axis (fourth picture). This is a
nearly complete crystal with etched terminations (common in gem
spodumene); one termination is partially broken. Starting about two
years ago, the Big Kahuna Zone
of the Oceanview Mine has been yielding the best kunzite to come from
southern California pegmatites since the 1950's.
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13818:
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Barite
Stoneham, Weld County, Colorado
7.1 x 2.5 x 1.7 cm (2.8 x 1.0 x 0.7 inches)
Specimen status: Sold
A light blue, mostly translucent barite
crystal group, with multiple terminations, giving the appearance of a
skyscraper group. Each termination is intact, although overall there
are a few chips and rough spots. The color and crystal form are very
typical for the locality.
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14703:
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Rhodochrosite - $20
Champion Mine, Cinnamon Pass, Park District, Hinsdale
County, Colorado
6.8 x 5.5 x 4.1 cm (2.7 x 2.2 x 1.6 inches)
Specimen status: Available Click
here to order
A matrix cleft is lined with small,
colorless quartz crystals, Atop the quartz crystals is a layer of
bright bubble gum pink rhodochrosite rhombohedra, which reach about 4
mm. Minor, massive, mixed sulfides (mostly pyrite) are scattered about.
A good example from this classic American rhodochrosite locality.
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9366:
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Ferberite and Quartz
Yaogangxian Mine, Yizhang County, Chenzhou Prefecture,
Hunan Province, China
5.8 x 4.1 x 2.7 cm (2.3 x 1.6 x 1.1 inches)
Specimen status: Sold
A flay matrix plate hosts a ridge of jet
black, lustrous ferberite crystals placed among a forest of mostly
transparent quartz points. The ferberite blades reach 1 cm in length,
and at least half have complete terminations. The longest quartz (last
picture) is 2.8 cm and sports a sharp termination. With care this
specimen might be trimmed to a thumbnail that emphasizes the sharp
ferberite/quartz combo featured in the last picture. The
November-December 2011 issue of Mineralogical Record features
an excellent article on this productive locality.
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9462:
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Malachite
Katanga, Democratic Republic of Congo
8.2 x 5.0 x 1.1 cm (3.2 x 2.0 x 0.4 inches)
Specimen status: Sold
A flat plate of deep green, opaque yet
lustrous malachite with an alligator skin texture. No damage. A
striking display with a stand.
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9486:
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Azurite, Malachite, Cerussite, Quartz, and
Barite
Aouli, Upper Moulouya lead district, Midelt,
Khénifra Province, Morocco
3.5 x 3.4 x 3.2 cm (1.4 x 1.3 x 1.3 inches)
Specimen status: Sold
A crystalline barite/quartz matrix hosts
small but glittering, deep blue azurite crystal rosettes, and a patch
of fuzzy, deep green malachite tufts. On top of this is a scattering of
colorless, translucent cerussite crystals, some of which are twinned.
Every face of this specimen is different. No damage.
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9588:
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Wulfenite and Vanadinite - $22
Erupción Mine, Mun. de Ahumada, Chihuahua,
Mexico
4.7 x 4.2 x 2.9 cm (1.9 x 1.7 x 1.1 inches)
Specimen status: Available Click
here to order
A cluster of deep butterscotch-brown
tabular wulfenite crystals accented with small sprays of somewhat
darker brown vanadinites, backed with a bit of gossan matrix.
Individual wulfenites reach 8 mm, generally have a good to glassy
luster, and some are bruised. Despite this, displays well as shown in
the photos without the need for a stand.
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