mineral

Quartz (Milky/Gold-stained)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent with yellow/gold iron staining; Luster: Vitreous (glassy) to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to translucent with yellow/gold iron staining
Luster: Vitreous (glassy) to greasy

Identified April 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling and crystallization of silica-rich magma or from hydrothermal solutions in veins. It is found in many geological environments ranging from Precambrian to the present day.

Uses & applications

Used widely in glass manufacturing, electronics (due to piezoelectric properties), construction as an abrasive, and frequently collected as mineral specimens or used in lapidary work/jewelry.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. This specific specimen shows iron oxide staining, which gives it the yellowish tint, a common feature in alluvial or 'river' quartz.

Field identification & locations

Identify in the field by its hardness (it can scratch glass and steel), lack of cleavage, and glassy luster. It is commonly found in riverbeds, mountains, and desert plains worldwide.