Granite, Aplite
Granite is an equigranular rock formed by the slow cooling of magma during plutonic activity, found in various locations around the world. Its pink to crimson hues are derived from the type of feldspar contained within. Fine-grained varieties are known as aplite.
Appealing for its graphic and diverse porphyritic textures
Basic Information
| English Name | Granite, Aplite |
|---|---|
| Japanese Name | Granite, Fine-grained granite |
| Main Composition | Aggregate of quartz, potassium feldspars, and mica |
| Structure | Aggregate structure (rock) |
| Hardness | 6.5–7 (overall) |
| Specific Gravity | Approx. 2.55 |
Features & Variations
- Graphic Granite: Appears in pegmatite transition zones, characterized by a unique pattern where quartz is regularly arranged like cuneiform script.
- Hebrew Stone: A variety where the graphic patterns resemble Hebrew characters.
Related & Similar
Related Stones: Dalmatian Jasper (which is actually aplite). The black spots are aggregates of micro-needle crystals of amphibole. → Jasper
Similar Stones: Gneiss (metamorphic rock).
Definition History: Defined by Werner as a "rock of quartz, feldspar, and mica." Black granite is gabbro.