metamorphic
Schist (Diamond Drill Core)
Mica Schist
Hardness: 3.5-4 (Mohs scale); Color: Silvery-grey, green, or charcoal; Luster: Pearly to metallic (silky surface); Structure: Foliated with visible mica flakes; Cleavage: Perfect basal cleavage in individual mica minerals.
- Hardness
- 3
- Color
- Silvery-grey, green, or charcoal
- Luster
- Pearly to metallic (silky surface)
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Physical properties
Hardness: 3.5-4 (Mohs scale); Color: Silvery-grey, green, or charcoal; Luster: Pearly to metallic (silky surface); Structure: Foliated with visible mica flakes; Cleavage: Perfect basal cleavage in individual mica minerals.
Formation & geological history
Formed from the regional metamorphism of shale or mudstone under intermediate to high temperature and pressure. These cores typically date from the Precambrian or Paleozoic eras depending on the exploration site.
Uses & applications
A common target in mineral exploration for hosting precious metals like gold/silver or base metals like copper. In industry, it is used as decorative stone or crushed aggregate.
Geological facts
The 'sheen' on the core surface is caused by the alignment of mica crystals. Diamond drill cores like these represent sections of the Earth's crust brought to the surface for geological mapping and resource estimation.
Field identification & locations
Identified in the field by its distinct foliation (schistosity) and 'glittery' appearance. Commonly found in metamorphic belts and orogenic zones globally. Collectors look for unique minerals embedded within, like garnet or staurolite.
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