Quartz (Milky or Citrine-tinted)

Physical Properties

Hardness: 7 on Mohs scale; Color: Yellowish-tan to milky white; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.

Formation & Geological History

Formed in igneous, metamorphic, and sedimentary environments. Typically crystallizes from magma or precipitates from hydrothermal veins. This specimen likely comes from a hydrothermal vein or a pegmatite deposit.

Uses & Applications

Used in glassmaking, ceramics, electronics (as oscillators due to piezoelectric properties), construction as an abrasive, and lower-grade specimens are often used for metaphysical purposes or landscaping.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'Quarz', potentially of Slavic origin meaning 'hard'.

Field Identification & Locations

Identify by its ability to scratch glass and lack of cleavage. Look for the characteristic 'waxy' or glass-like luster on fresh breaks. Common worldwide in mountain ranges and riverbeds.

Identified on: 4/23/2026

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