mineral

Milky quartz with black mineral inclusions

Quartz (SiO₂), likely with dark tourmaline or another iron-rich inclusion

AI-generated identification · may be incorrect

White, translucent to opaque, glassy-to-greasy luster; Mohs hardness 7; hexagonal crystal structure, no cleavage, and uneven fracture. The small black inclusion cannot be identified confidently from the photo.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly forms when silica-rich fluids cool and crystallize in veins or cavities, often in igneous and metamorphic settings. The specimen’s age and exact geological setting cannot be determined from the image.

Uses & applications

Quartz is used in glassmaking, electronics, and decorative objects; attractive specimens are collected or used in jewelry.

Geological facts

Milky appearance comes from microscopic fluid or gas inclusions that scatter light. Dark inclusions in quartz may be tourmaline, but visual confirmation would require closer examination.

Field identification & locations

Look for hardness sufficient to scratch glass, lack of cleavage, and a glassy fracture surface; common worldwide in quartz veins and pegmatites. Avoid identifying the black material from color alone.