mineral

Druzy Quartz on Sandstone

Silicon Dioxide (SiO2) on Sedimentary Host Rock

Hardness: 7 (quartz) vs 6 (sandstone). Color: Brownish-tan matrix with clear to white crystals. Luster: Vitreous (glassy) crystals on a dull (earthy) matrix. Crystal structure: Trigonal/Hexagonal crystals.

Hardness: 7 (quartz) vs 6 (sandstone)
Color: Brownish-tan matrix with clear to white crystals
Luster: Vitreous (glassy) crystals on a dull (earthy) matrix

Identified June 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal precipitation where silica-rich fluids circulated through the pores or cavities of sedimentary sandstone, cooling and crystallizing over thousands of years.

Uses & applications

Primarily used as decorative specimens or in 'earthy' jewelry styles. Quartz also has industrial applications in electronics and glassmaking, though not usually from this specific form.

Geological facts

The term 'Druzy' (or Drusy) refers to the tiny glittering crystals that coat a rock surface like sugar. This specimen specifically showcases a vug, or a small cavity, lined with these crystals.

Field identification & locations

Identified in the field by the sparkling 'glitter' effect when held to the light. Common in iron-rich sedimentary basins. Collectors should look for host rocks with cavities or fractures where secondary mineral growth occurs.

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

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Nephrite Jade

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Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

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mineral