Quartz (Smoky or Clear variety with inclusions)

Physical Properties

Hardness: 7 on Mohs scale; Color: Clear to grayish-green with dark inclusions; Luster: Vitreous (glass-like); Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture).

Formation & Geological History

Formed in igneous, metamorphic, and sedimentary environments, most commonly crystallized from cooling magma into pegmatites or hydrothermal veins. Quartz is ubiquitous across all geological ages.

Uses & Applications

Used widely in glassmaking, electronics (piezoelectric properties), abrasives, and as a semi-precious gemstone in jewelry or for metaphysical collection.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Specimens like this often contain 'chlorite' or 'schorl' (black tourmaline) inclusions that create the dark, mossy patterns seen inside.

Field Identification & Locations

Identify in the field by its hardness (scratches glass) and lack of cleavage (breaks like glass). This specific specimen appears to be a small water-worn pebble or a fragment from a crystalline vein.

Identified on: 4/14/2026

Mode: Standard