igneous
Granite Pebble
Granite (Felsic Intrusive Igneous Rock)
Hardness: 6-7 on Mohs scale. Color: Tan, cream, and gray with dark speckles. Luster: Dull to vitreous. Crystal Structure: Phaneritic (visible grains) consisting of quartz, feldspar, and mica. Specific Gravity: 2.63 to 2.75.
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, cream, and gray with dark speckles
- Luster
- Dull to vitreous
Identified More igneous →
Explore Granite Pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6-7 on Mohs scale. Color: Tan, cream, and gray with dark speckles. Luster: Dull to vitreous. Crystal Structure: Phaneritic (visible grains) consisting of quartz, feldspar, and mica. Specific Gravity: 2.63 to 2.75.
Formation & geological history
Formed from the slow cooling of silica-rich magma deep underground. This specific specimen has been rounded and smoothed by water erosion in a river, beach, or glacial environment. Geological age can range from billions of years to more recent eras depending on the source pluton.
Uses & applications
In pebble form, used for landscaping, decorative garden paths, and aquarium gravel. In bulk stone form, used for countertops, construction, and monuments.
Geological facts
Granite makes up the majority of the Earth's continental crust. Because of its high quartz content, granite pebbles are extremely durable and can withstand chemical weathering better than many other rock types.
Field identification & locations
Identify by its 'salt and pepper' appearance and visible interlocking crystals. Can be found globally in riverbeds, glacial moraines, and along coastlines near crystalline basement rock. Collectors often look for colorful variations or unique rounding.
