igneous
Quartz-Tourmaline Pebble
Quartz with Tourmaline inclusions
AI-generated identification · may be incorrectHardness: 7 on Mohs scale. Color: White/translucent matrix with black prismatic inclusions. Luster: Vitreous to greasy. Crystal structure: Trigonal (quartz), Hexagonal (tourmaline). Cleavage: None (conchoidal fracture for quartz). Specific gravity: 2.65 - 3.2.
- Hardness
- 7 on Mohs scale
- Color
- White/translucent matrix with black prismatic inclusions
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale. Color: White/translucent matrix with black prismatic inclusions. Luster: Vitreous to greasy. Crystal structure: Trigonal (quartz), Hexagonal (tourmaline). Cleavage: None (conchoidal fracture for quartz). Specific gravity: 2.65 - 3.2.
Formation & geological history
Formed through hydrothermal processes where silica-rich fluids and boron-bearing solutions crystallized within pegmatites or metamorphic veins, subsequently weathered and transported to form water-worn pebbles.
Uses & applications
Used primarily in lapidary work, decorative cabochons, tumbling, and as mineral specimens for collectors.
Geological facts
Tourmalinated quartz combines the amplifying properties of quartz with the protective properties of black tourmaline in metaphysical lore, and is a durable and popular lapidary stone due to the striking contrast.
Field identification & locations
Found in stream beds and beaches globally where granitic pegmatites erode. Easily identified by the stark black tourmaline needles contrasting against the white quartz background.
