orthoclase


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Related to orthoclase: biotite, albite, microcline
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a white or colored monoclinic feldspar

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sediments, which are low in K-bearing minerals such as mica and orthoclase, which produces illite following weathering.
Mohs Hardness Scale (the greater the number, the greater the hardness) Mohs Mineral Actual Hardness 2 Gypsum 3 3 Calcite 9 4 Fluorite 21 5 Apatite 48 6 Orthoclase Feldspar 72 7 Quartz 100 8 Topaz 200 9 Corundum 400 10 Diamond 1,600
Values in parentheses are the standard errors in the last significant figures derived from the Rietveld analysis Quartz Kaolinite Smectite Orthoclase Albite Anatase Dome saprolite at 0.
Whereas the occurrence of larger feldspar, orthoclase and plagioclase phenocrysts are common in West Pacific volcanic glass sources (Smith 1974), none of those samples containing microphenocrysts are from the Kutao/Bao source of West New Britain.
It is a medium-grained, light grey, salt-and-pepper granodiorite, and is composed essentially of quartz, orthoclase and plagioclase feldspar, minor biotite and hornblende, and accessory magnetite.
47 What completes this list: talc, gypsum, calcite, flurorite, apatite, orthoclase feldspar, quartz, topaz, corundum.
The feldspar fraction is dominantly altered orthoclase feldspar and perthitic ortho-clase feldspar with traces of microcline and plagioclase.
granite: A common, coarse-grained, light-colored, hard igneous rock consisting chiefly of quartz, orthoclase or microcline, and mica; very dense and nonporous.
These are two types of feldspars of which plagioclase feldspars are more abundant than K-feldspars like orthoclase and microcline.
Spilitic to albitophyric parageneses--sericitized plagioclase, chlorite, actinolite (replacing augite), epidote, albite [+ o -] orthoclase, quartz and carbonates--have also been observed.
37 In what branch of science would you be most likely to deal with orthoclase and plagioclase?
from primary minerals such as orthoclase (Figure 2-17).