Agate is a microcrystalline variety of silica, chiefly chalcedony, characterised by its fineness of grain and brightness of colour. Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks and can be common in certain metamorphic rocks.
Most agates occur as nodules in volcanic rocks or ancient lavas where they represent cavities originally produced by the disengagement of volatiles in the molten mass which was then filled, wholly or partially, by siliceous matter deposited in regular layers upon the walls. Agate has also been known to fill veins or cracks in volcanic or altered rock underlain by granitic intrusive masses. Such agates, when cut transversely, exhibit a succession of parallel lines, often of extreme tenuity, giving a banded appearance to the section. Such stones are known as banded agate, riband agate and striped agate.
| Category | Agate Properties |
|---|---|
| Formula | SiO2 silicon dioxide |
| Color | White to grey |
| Crystal habit | Cryptocrystalline silica |
| Crystal system | Rhombohedral Microcrystalline |
| Cleavage | None |
| Fracture | Conchoidal with very sharp edges |
| Mohs scale hardness | 6.5-7 |
| Luster | Waxy |
| Diaphaneity | Translucent |
| Specific gravity | 2.58-2.64 |
I use agate mortar and pestle in my materials research lab, so I have experience using very expensive high quality ones. I initially thought for this low price to have one at home for precision grinding needs. I’m very impressed! It is of a really good quality.
Sandar
I just purchased one of these agate mortar and pestles. It is of a really good quality.