Spessartine from Thomas Range, Utah, USA - image 1
Spessartine from Thomas Range, Utah, USA - image 2

Spessartine from Thomas Range, Utah, USA

$35.00

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A loose dark complete lustrous crystal of almandine-spessartine hosting small crystals of topaz. In good condition all around. Collected by Ray DeMark in June, 1977. Situated in Juab County, western Utah, the Thomas Range is composed of Tertiary volcanic rocks, notably topaz-bearing rhyolite flows and tuffs that erupted around twenty-one million years ago. As these silicic magmas cooled, fluorine-rich vapor trapped within cavities and gas vesicles allowed gem-quality topaz crystals to crystallize alongside other minerals. Indigenous populations and early pioneers were long aware of these deposits, but formal mineral collecting exploded in the mid-twentieth century when the area became famous as Topaz Mountain. Today, the location remains a world-renowned public collecting site, actively managed for rockhounds and amateur miners who search the weathered rhyolite and gravels for sherry-colored topaz crystals that bleach to clear or pale amber upon exposure to sunlight.

Product details

SpeciesSpessartineTopazAlmandine
SizeThumbnail
Dimensions1.2 x 1.1 x 1.0 cm
Listed on10/21/2026
LocalityUSA, Utah, Thomas Range
SKU2063398

Current owner

WM
Weinrich MineralsFeatured
3,650 for sale·9 sold

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Spessartine
Mineral guide
Learn about Spessartine
(Mn3Al2Si3O12) is the vivid orange garnet prized for gemmy, sharp crystals and brilliant luster; forms with smoky quartz and feldspar.
Spessartine
Regional guide
Spessartine from Thomas Range
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Locality guide
Thomas Range
Thomas Range, USA — premier locality yielding topaz, bixbyite, red beryl from lithophysal cavities in rhyolite; crisp, glassy crystals prized by collectors.