mineral

Quartz with inclusions (likely Tourmaline or Biotite)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: Smoky grey to white with black inclusions, Luster: Vitreous (glassy), Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture)

Identified May 10, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: Smoky grey to white with black inclusions, Luster: Vitreous (glassy), Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture)

Formation & geological history

Formed in igneous or metamorphic environments, particularly pegmatites or hydrothermal veins where cool silica-rich fluids crystallized over millions of years alongside other minerals like tourmaline.

Uses & applications

Used primarily in lapidary work, jewelry making, ornamental decor, and as mineral specimens for collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Inclusions like the black ones shown here are often referred to as 'rutilated' (if needle-like) or 'schorl tourmaline' when they appear as solid black rods or masses.

Field identification & locations

Look for its glassy luster and ability to scratch glass (hardness test). It is commonly found in gravel pits, riverbeds, and mountainous regions worldwide. For identification, check for lack of cleavage and the presence of distinct internal mineral fibers.

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