metamorphic
Quartz with Schist Inclusion
Quartz (SiO2) with micaceous schist inclusions
Hardness: 7 (Quartz body), 2.5-4 (Schist inclusions); Color: Milky white with black/dark grey bands; Luster: Vitreous to waxy; Structure: Hexagonal (Quartz) and foliated (Schist); Cleavage: None (Quartz) and perfect basal (Mica)
- Hardness
- 7 (Quartz body), 2
- Color
- Milky white with black/dark grey bands
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Quartz body), 2.5-4 (Schist inclusions); Color: Milky white with black/dark grey bands; Luster: Vitreous to waxy; Structure: Hexagonal (Quartz) and foliated (Schist); Cleavage: None (Quartz) and perfect basal (Mica)
Formation & geological history
Formed through regional metamorphism where silica-rich fluids crystallized into quartz around existing metamorphic rock fragments (schist or phyllite). These often originate in hydrothermal veins or high-pressure metamorphic environments.
Uses & applications
Primarily collected as river stones or decorative garden rocks. Tumbled and polished versions are used in landscaping and crystal healing. Quartz is used in electronics and glass manufacturing.
Geological facts
The dark pattern in this specific specimen is purely a coincidence of nature, but it resembles a silhouette of a raven or crow, making it a 'picture stone' or 'mimetolith'.
Field identification & locations
Identify by the high hardness of the white matrix (will scratch glass) and the layered, flaky texture of the black inclusions. Commonly found in riverbeds in mountainous regions like the Appalachians or Alps.
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