Rock Identifier
Quartz with Mica inclusions (Gold-colored Mica) (Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (Phlogopite/Muscovite) inclusions) — Mineral
Mineral

Quartz with Mica inclusions (Gold-colored Mica)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (Phlogopite/Muscovite) inclusions

Hardness: 7 (Quartz) / 2-3 (Mica); Color: Translucent white to tan with golden-metallic flakes; Luster: Vitreous (glassy) for quartz, pearly/metallic for mica; Crystal Structure: Hexagonal (Quartz), Monoclinic (Mica); Cleavage: Indistinct in quartz, perfect basal in mica.

Hardness
7 (Quartz) / 2-3 (Mica)
Color
Translucent white to tan with golden-metallic flakes
Luster
Vitreous (glassy) for quartz, pearly/metallic for mica
Identified More mineral →

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Physical properties

Hardness: 7 (Quartz) / 2-3 (Mica); Color: Translucent white to tan with golden-metallic flakes; Luster: Vitreous (glassy) for quartz, pearly/metallic for mica; Crystal Structure: Hexagonal (Quartz), Monoclinic (Mica); Cleavage: Indistinct in quartz, perfect basal in mica.

Formation & geological history

Formed in hydrothermal veins or pegmatites during the cooling of magma. As silica-rich fluids crystallized into quartz, plates of mica grew within or were trapped by the crystal matrix. Often found in Precambrian to Cenozoic geological settings.

Uses & applications

Used primarily for display specimens, lapidary work (cabochons), and metaphysical collections. Industrial quartz is used in glass making and electronics, while mica is used as an insulator.

Geological facts

This specimen is often mistaken for gold due to the golden-yellow reflection of the mica flakes, a phenomenon historically used by prospectors to identify 'Fool\'s Gold' or similar sparkling non-precious minerals.

Field identification & locations

Identify in the field by checking harness (quartz will scratch glass) and looking for the characteristic 'flash' of mica flakes when angled against light. Common in mountain regions with igneous activity like the Rockies or Appalachians.

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