mineral
Milky Quartz with Iron Inclusions
Crystalline Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Milky white with reddish-brown iron oxide staining; Luster: Vitreous to waxy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture).
- Hardness
- 7 on Mohs scale
- Color
- Milky white with reddish-brown iron oxide staining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky white with reddish-brown iron oxide staining; Luster: Vitreous to waxy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed in hydrothermal veins or as a primary constituent of igneous rocks like granite. The reddish tint comes from hematite or limonite leaching into micro-fractures over geological time.
Uses & applications
Used in glassmaking, abrasives, electronics (piezoelectric properties), and as decorative landscaping stone or collectibles.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Specimens with red 'veining' are often colloquially called Hematoid Quartz or Fire Quartz.
Field identification & locations
Identified in the field by its hardness (it will scratch glass), lack of cleavage, and resistance to weathering. Commonly found in riverbeds and mountainous regions globally.
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Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
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metamorphic
Gypsum (variety Selenite or Alabaster)
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Mineral
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Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous