igneous
Bull Quartz with Mica and Host Rock
Massive Quartz (SiO2) with Muscovite/Chlorite inclusions
Hardness: 7 (Mohs); Color: Milky white to translucent with green/grey mineral veins; Luster: Vitreous to greasy; Crystal structure: Trigonal (massive form); Cleavage: None (conchoidal fracture).
- Hardness
- 7 (Mohs)
- Color
- Milky white to translucent with green/grey mineral veins
- Luster
- Vitreous to greasy
Identified More igneous →
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Physical properties
Hardness: 7 (Mohs); Color: Milky white to translucent with green/grey mineral veins; Luster: Vitreous to greasy; Crystal structure: Trigonal (massive form); Cleavage: None (conchoidal fracture).
Formation & geological history
Formed from hydrothermal veins or within pegmatites where silica-rich fluids cooled slowly in cracks of the Earth's crust. Often associated with metamorphic or igneous environments containing granite.
Uses & applications
Used primarily as a source of silicon for electronics, in glass manufacturing, as a flux in metallurgy, and as common landscaping or decorative stone.
Geological facts
Quartz is one of the most abundant minerals on Earth. Massive white quartz is often called 'Bull Quartz' by miners because it is tough to mine through but often serves as an indicator for valuable ore veins like gold.
Field identification & locations
Identify by its hardness (scratches glass), lack of cleavage, and milky appearance. It is found globally, particularly in mountainous regions with exposed granitic bedrock.
