Milky Quartz with Pyrite inclusions

Physical Properties

Hardness: Quartz 7 (Mohs), Pyrite 6-6.5; Color: White to translucent with brassy gold metallic flecks; Luster: Vitreous to greasy (quartz) and metallic (pyrite); Crystal Structure: Trigonal (quartz) and Isometric (pyrite); Cleavage: None/Conchoidal.

Formation & Geological History

Formed in hydrothermal veins and pegmatites through precipitation from hot, mineral-rich fluids escaping from cooling magma deep within the Earth's crust.

Uses & Applications

Primarily collected as mineral specimens; Quartz is used in electronics and glass manufacturing, while Pyrite was historically a source of sulfur.

Geological Facts

Pyrite is known as 'Fool\'s Gold' because its metallic luster often tricks novice prospectors into thinking they have found real gold; however, it is much harder and more brittle than gold.

Field Identification & Locations

Identify by quartz's ability to scratch glass and pyrite's brassy color and greenish-black streak. Commonly found in mountainous regions near volcanic or tectonic activity.

Identified on: 5/15/2026

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