mineral

Aventurine (Tan/Cream colored)

Quartz (SiO2) with mineral inclusions

Hardness: 7 (Mohs), Color: Tan/Cream, Luster: Vitreous to waxy, Crystal structure: Trigonal/Microcrystalline, Specific gravity: 2.64-2.69

Identified May 7, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs), Color: Tan/Cream, Luster: Vitreous to waxy, Crystal structure: Trigonal/Microcrystalline, Specific gravity: 2.64-2.69

Formation & geological history

Formed in magmatic and metamorphic environments where quartz-rich fluids crystallize. The tan color is often due to inclusions of mica (muscovite) or iron oxides.

Uses & applications

Jewelry (beads, cabochons), ornate carvings, and as a popular stone for collectors interested in metaphysical properties.

Geological facts

While green is the most common color of aventurine, it naturally occurs in shades of orange, yellow, tan, and gray. The characteristic shimmer is called 'aventurescence'.

Field identification & locations

Identify by its hardness (scratches glass) and its subtle reflective particles when rotated under light. Found globally with large deposits in India, Russia, and Brazil.

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