Definition of Orthoclase. Meaning of Orthoclase. Synonyms of Orthoclase

- Orthoclase, or orthoclase feldspar (endmember formula KAlSi3O8), is an important tectosilicate mineral which forms igneous rock. The name is from the...
- g. calcite CaCO3), sulfates (e.g. gypsum CaSO4·2H2O), silicates (e.g. orthoclase KAlSi3O8), molybdates (e.g. wulfenite PbMoO4) and phosphates (e.g. pyromorphite...
- This effect is caused by light diffraction through alternating layers of orthoclase and albite within the stone. The diffracted light varies from white to...
- Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase. Sanidine is a polymorph of alkali feldspar...
- three endmembers: orthoclase endmember KAlSi3O8 albite endmember NaAlSi3O8 anorthite endmember CaAl2Si2O8 Solid solutions between orthoclase and albite are...
- Unakite is a metamorphic rock that is altered granite composed of pink orthoclase feldspar, green epidote, and generally colorless quartz. It was first...
- whether they crystallized in-depth or near the surface, e.g., hypersthene, orthoclase, quartz. There are some curious instances of rocks having the same chemical...
- effect is sometimes seen in orthoclase: hence two kinds of sunstone are distinguished as "oligoclase sunstone" and "orthoclase sunstone". Sunstone was not...
- specific types of granitoids. The alkali feldspar in granites is typically orthoclase or microcline and is often perthitic. The plagioclase is typically sodium-rich...
- hardness (e.g. topaz-rich granite contains: topaz — Mohs 8, quartz — Mohs 7, orthoclase — Mohs 6, plagioclase — Mohs 6–6.5, mica — Mohs 2–4). Despite its lack...