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some are crosscut by dark shock veinlets and show brecciated structure with light grey matrix surrounding lighter colored
An interesting thing about pyrite is its association with ancient civilizations
The crystal face of this piece is a natural window
Quartz and Prehnite Geode
Calcite Crystal | 96 gr | Limestone Quarry Povodje | Ljubljana, Slovenia Mont Saint Hilaire some are crosscut by darkThis is an attractive specimen of calcite crystals from Limestone Quarry, Povodje, Ljubljana, Slovenia. The entire top surface of the specimen is covered with many sharp well formed golden calcite crystals. It is in excellent condition. Calcite is found throughout the world in sedimentary, metamorphic, and igneous rocks. Some geologists consider it to be a "ubiquitous mineral" one that is found everywhere. Calcite is the principal constituent of
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