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Orthoclase, or orthoclase feldspar (endmember formula KAlSi3O8), is an important tectosilicate mineral which forms igneous rock. The name is from the...8 KB (598 words) - 15:55, 2 May 2024
This effect is caused by light diffraction through alternating layers of orthoclase and albite within the stone. The diffracted light varies from white to...5 KB (393 words) - 05:53, 27 May 2024
Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase. Sanidine is a polymorph of alkali feldspar...8 KB (633 words) - 14:07, 26 January 2024
effect is sometimes seen in orthoclase: hence two kinds of sunstone are distinguished as "oligoclase sunstone" and "orthoclase sunstone". Sunstone was not...8 KB (692 words) - 08:51, 1 November 2023
potassium: Orthoclase (endmember formula KAlSi3O8), an important tectosilicate mineral that forms igneous rock Microcline, chemically the same as orthoclase, but...748 bytes (113 words) - 19:03, 4 June 2024
those where potassium is replaced by barium. The first of these include: orthoclase (monoclinic) KAlSi3O8 sanidine (monoclinic) (K,Na)AlSi3O8 microcline (triclinic)...25 KB (2,434 words) - 10:59, 30 May 2024
Unakite is a metamorphic rock that is altered granite composed of pink orthoclase feldspar, green epidote, and generally colorless quartz. It was first...2 KB (251 words) - 05:35, 23 April 2024- 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...57 KB (7,063 words) - 06:41, 26 November 2023
An example of a series of mineral reactions is illustrated as follows. Orthoclase feldspar (KAlSi3O8) is a mineral commonly found in granite, a plutonic...110 KB (13,012 words) - 21:01, 19 May 2024- Oneillite Oosterboschite Oppenheimerite Ordóñezite Oregonite Orpiment Orthoclase Osarizawaite Osmium Osumilite Otavite Ottrelite Otwayite Varieties that...41 KB (2,732 words) - 20:21, 2 June 2024
granite is a hornblende-biotite granite containing large round crystals of orthoclase each with a rim of oligoclase (a variety of plagioclase). The name has...10 KB (1,074 words) - 07:16, 27 April 2024
(near albite, NaAlSi3O8, in composition). Typically, the host grain is orthoclase or microcline, and the lamellae are albite. If sodic feldspar is the dominant...3 KB (335 words) - 14:34, 20 January 2024
topaz-rich granite contains: topaz - hardness 8, quartz - hardness 7, orthoclase feldspar - hardness 6, plagioclase feldspar - hardness 6 to 6.5, mica...18 KB (1,174 words) - 20:46, 3 June 2024- felsic rock is granite. Common felsic minerals include quartz, muscovite, orthoclase, and the sodium-rich plagioclase feldspars (albite-rich). In modern usage...6 KB (629 words) - 17:45, 27 January 2024
intrusive, felsic, igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars. It is typically a light colored phaneritic...4 KB (435 words) - 18:59, 19 January 2024- (Black Mica) Plagioclase (Sodium rich) Relative Crystallization Temperature Orthoclase (K-feldspar) Muscovite (White Mica) Quartz (Felsic mineral) Low...5 KB (492 words) - 01:52, 13 July 2022
- is studded with 1,660 diamonds, and is made from quartz, platinum, and orthoclase. The miniature surprise flower basket is studded with 1,378 diamonds and...4 KB (371 words) - 02:51, 18 June 2023
because volcanic rocks are often rich in potassium-bearing minerals such as orthoclase, and erode relatively easily. Volcanic debris, especially lahars, also...33 KB (3,686 words) - 04:33, 9 April 2024
(which is 0.04% potassium by weight), and occurs in many minerals such as orthoclase, a common constituent of granites and other igneous rocks. Potassium is...93 KB (10,765 words) - 10:13, 24 May 2024
v t e Mohs scale of mineral hardness 1 Talc 2 Gypsum 3 Calcite 4 Fluorite 5 Apatite 6 Orthoclase 7 Quartz 8 Topaz 9 Corundum 10 Diamond...28 KB (3,072 words) - 15:18, 2 May 2024
- Orthoklas m (strong, genitive Orthoklases, no plural) (mineralogy) orthoclase Declension of Orthoklas [sg-only, masculine, strong] 1Now rare, see notes
- the rock. We meet also with many porphyritic granites containing large orthoklas crystals, and with others containing albite in greater proportion. Some