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.7" Vitreous Black Topaz Crystal Cluster - Utah
This is a relatively uncommon black topaz specimen collected from the SK Star #2 Claim in Juab County, Utah. The crystals show off an alluring vitreous luster consistent with that of the typical translucent topaz specimens found in this mountain range, but instead contains mineral inclusions that inhibit this translucency without being detrimental to the crystals' natural beauty. It is accompanied by an acrylic perky display case and mineral tack.
About Black Topaz from SK Star #2 Claim
Topaz crystals from the SK Star #2 Claim, along with those from the SK Star #1 Claim, often display unique black coloration caused by microscopic inclusions (roughly 30 micrometers in size) of magnetite, biotite, and tungsten-rich ixiolite. A rupturing fault during crystallization is theorized to have allowed fluid interference that deposited these elements. They were discovered in early 2015 by Sean Rasmussen and Krisann Morrill, who initially mistook the black crystals for obsidian.
Topaz crystals from the SK Star #2 Claim, along with those from the SK Star #1 Claim, often display unique black coloration caused by microscopic inclusions (roughly 30 micrometers in size) of magnetite, biotite, and tungsten-rich ixiolite. A rupturing fault during crystallization is theorized to have allowed fluid interference that deposited these elements. They were discovered in early 2015 by Sean Rasmussen and Krisann Morrill, who initially mistook the black crystals for obsidian.
About Topaz
Topaz is a rare silicate mineral that is also considered to be a semi-precious gemstone. It occurs naturally in a wide range of colors, but most natural topaz is colorless to light yellow. Topaz has a hardness of 8 on the Mohs hardness scale: diamonds, corundum, and chrysoberyl the are the only harder commonly known minerals.
It primarily forms crystals within veins and voids of volcanic rocks. The crystals grow during the later stages of magma cooling while degassing releases the fluorine required for crystal formation. Topaz crystals are either mined from inside these voids in pegmatites or collected after they have eroded out of the rock.
Most topaz is light sensitive and can fade in color if exposed to direct sunlight for too long.
General Chemical Formula - Al₂SiO₄(F,OH)₂
Topaz is a rare silicate mineral that is also considered to be a semi-precious gemstone. It occurs naturally in a wide range of colors, but most natural topaz is colorless to light yellow. Topaz has a hardness of 8 on the Mohs hardness scale: diamonds, corundum, and chrysoberyl the are the only harder commonly known minerals.
It primarily forms crystals within veins and voids of volcanic rocks. The crystals grow during the later stages of magma cooling while degassing releases the fluorine required for crystal formation. Topaz crystals are either mined from inside these voids in pegmatites or collected after they have eroded out of the rock.
Most topaz is light sensitive and can fade in color if exposed to direct sunlight for too long.
General Chemical Formula - Al₂SiO₄(F,OH)₂
SPECIES
Topaz
LOCATION
SK Star #2 Claim, Juab County, Utah
SIZE
.7" long
CATEGORY
ITEM
#347137
