CHARACTERISTICS | |
Weight | 690 gr |
Size | 120x70x50 mm |
Reference | 211106556 |
Mineral | mineral species Microcline |
Category | Decoration stones |
Group | Free forms |
Country | Madagascar |
Formula KAlSi3O8] MICROCLINE | |||
O | Oxygen | Other no metal | 45.99% |
Si | Silicon | Metalloids | 30.27% |
K | Potassium | Alkali metal | 14.05% |
Al | Aluminum | Poor metal | 9.69% |
100% | |||
Microcline is a mineral from the feldspar family, which are silicates of aluminium, potassium, sodium and calcium. Its chemical formula is KAlSi3O8, which means it contains potassium (K), aluminum (Al) and silicon (Si), as well as oxygen (O).
The microcline crystallizes in the triclinic system, which means it has three different crystal axes and different angles between them. It usually occurs as elongated prismatic crystals, often with ridged faces. The crystals can be transparent to opaque and their color varies from white, gray, pink to red.
Microcline is a relatively hard mineral, with a hardness of 6 on the Mohs scale. It has an average density of 2.5 g/cm3 and an uneven to conchoidal fracture. It is insoluble in water and does not react with acids.
Microcline is often associated with other minerals in igneous rocks, such as quartz, muscovite and biotite. It is also used as a gemstone, but its relatively low hardness makes it less scratch resistant than other gemstones.
Finally, the microcline can exhibit an optical peculiarity called “adularescence,” which is an internal light reflection that creates a blue or white glow on the surface of the mineral when cut into a cabochon. This characteristic is often seen in gemstones called “Labradorite”.
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