igneous
Vesicular Rhyolite
Rhyolite (High-silica volcanic rock)
Hardness: 6-7 (Mohs scale); Color: cream, tan, or buff; Luster: dull to earthy; Texture: vesicular (pitted with gas bubbles); Structure: fine-grained (aphanitic) matrix; Specific Gravity: 2.4-2.6.
- Hardness
- 6-7 (Mohs scale)
- Color
- cream, tan, or buff
- Luster
- dull to earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: cream, tan, or buff; Luster: dull to earthy; Texture: vesicular (pitted with gas bubbles); Structure: fine-grained (aphanitic) matrix; Specific Gravity: 2.4-2.6.
Formation & geological history
Formed from the rapid cooling of silica-rich (felsic) lava. The pits or holes (vesicles) are created by gas bubbles trapped in the magma as it solidifies near the earth's surface.
Uses & applications
Occasionally used as decorative stone, in construction as aggregate, or as an abrasive material. High-quality varieties are popular with amateur rock collectors.
Geological facts
Rhyolite is the volcanic equivalent of granite. It is extremely viscous when molten, which often leads to explosive eruptions. Beautiful banded varieties are known as 'Wonderstone'.
Field identification & locations
Identified by its light color, lightweight feel compared to basalt, and the presence of small holes or voids. Commonly found in volcanic arc regions and continental rift zones.
