Rock Identifier
Gemstone Sand (Mineral Assortment) (Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)) — mineral
mineral

Gemstone Sand (Mineral Assortment)

Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)

Hardness: Varied (typically 6.5-7.5 Mohs); Color: Multi-colored (pink, green, amber, clear); Luster: Vitreous (glassy); Structure: Varied (Hexagonal, Trigonal, Isometric); Cleavage: Mostly poor or absent; SG: 2.6-4.3.

Hardness
Varied (typically 6
Color
Multi-colored (pink, green, amber, clear)
Luster
Vitreous (glassy)
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Physical properties

Hardness: Varied (typically 6.5-7.5 Mohs); Color: Multi-colored (pink, green, amber, clear); Luster: Vitreous (glassy); Structure: Varied (Hexagonal, Trigonal, Isometric); Cleavage: Mostly poor or absent; SG: 2.6-4.3.

Formation & geological history

Formed through both igneous crystallization in pegmatites and metamorphic processes. These small grains represent 'heavy mineral' concentrates often found in alluvial deposits or as residual weathering from host rock.

Uses & applications

Used primarily in lapidary 'paydirt' bags for hobbyists, educational kits, miniature sand art, or as raw material for micro-faceted jewelry accents.

Geological facts

These tiny grains are often referred to as 'gem gravel.' In places like Sri Lanka or Madagascar, similar large-scale deposits provided the world's most famous gemstones through centuries of alluvial mining.

Field identification & locations

Identify in the field by panning stream sediments or dry-sieving alluvial soil. Look for high-clarity grains with saturated colors and geometric shapes that survive transport better than softer rock fragments.

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