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Topaz Greisen with Scheelite–Fluorite Vein — Einstein Mine, Silver Mine, Madison County, Missouri
Ex-Charley Cox Collection
About 1.47 billion years ago, the Silvermines Granite cooled and cracked. Into those fractures came the last, hottest fluids the magma had left — charged with fluorine, tungsten, tin, and silver. They didn\'t just fill the fractures. They ate the granite from the walls inward, stripping out feldspar and rebuilding it as topaz, zinnwaldite, and sericite. Geologists call that greisen. It is the signature rock of this district locale and there is nothing else like it in the Mississippi Valley.
This specimen is the contact itself — the exact boundary where vein met wall rock.
The polished curved face reads left to right like a cross-section of that event. Pale cream-to-straw topaz greisen carries dark green-black chlorite clots and zinnwaldite, threaded with limonite-stained seams. Violet fluorite pools at the quartz grain boundaries. Pinpoint pyrite glints through the darker patches, along with tiny flecks of argentiferous galena — the mineral that started it all, the ore Hiram Tong found in 1862 while following turkey tracks up the St. Francois River.
Under shortwave UV the piece transforms. A white seam runs the full width of the face and lights blue — scheelite, the tungsten ore that brought this mine back to life for two world wars. The fluorite answers in purple. Scattered points glow sherbet orange and cherry red from apatite in the greisen, each with a brief phosphorescent tail after the lamp cuts. Four distinct responses on one face, all verified by hand — the red and orange were tested with dilute acid and showed no reaction, ruling out calcite.
The Einstein was worked for silver from about 1877 to 1894, then reopened for tungsten from 1916 to 1946. It sits inside Silver Mines State Park today. No collecting is permitted in this now collapsed flooded mine. Material like this only exists because someone gathered it decades ago — and this one carries Cox Collection provenance.
Specifications
Dimensions: 4.25\" x 2.5\" x 2\"
Weight: 445 grams
Preparation: curved polished display face, cut base that stands firmly on its own, natural back
Locality: Einstein Mine, Silver Mine, Fredericktown Mining District, Madison County, Missouri
Provenance: ex-Charley Cox Collection
Species present: topaz, quartz, chlorite, zinnwaldite, apatite, fluorite, scheelite, pyrite, argentiferous galena, goethite/limonite
Fluorescence: scheelite blue, fluorite purple, apatite orange and red with brief phosphorescence (SW)
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