metamorphic
Yellow Quartzite (Tumbled)
Quartzite (SiO2)
Hardness: 7 (Mohs scale); Color: Pale yellow to honey gold; Luster: Vitreous to waxy (when polished); Crystal Structure: Hexagonal/Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.63–2.65
- Hardness
- 7 (Mohs scale)
- Color
- Pale yellow to honey gold
- Luster
- Vitreous to waxy (when polished)
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Physical properties
Hardness: 7 (Mohs scale); Color: Pale yellow to honey gold; Luster: Vitreous to waxy (when polished); Crystal Structure: Hexagonal/Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.63–2.65
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone. High heat and pressure cause quartz grains to recrystallize and fuse together, creating a incredibly hard, dense rock. The yellow color is typically caused by iron oxide inclusions (limonite).
Uses & applications
Used primarily as decorative stone, aquarium gravel, landscape material, and in tumbled form for crystal healing or pocket stones. High-grade quartzite is also used for building facades and countertops.
Geological facts
Quartzite is so hard that it can scratch glass and steel. It is frequently mistaken for similar-looking marble, but marble is much softer and will fizz when exposed to acid, whereas quartzite will not.
Field identification & locations
Identify in the field by its grainy, sugary texture under a lens and its extreme hardness. It won't be scratched by a knife blade. Commonly found in folded mountain belts and ancient shield regions globally.
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