pyrophyllite
pyrophyllite Uncommon silicate mineral Al2[Si4O10](OH)2 belonging to the phyllosilicates (sheet silicates) and with properties similar to muscovite; sp. gr. 2.65–2.90; hardness 1–2; occurs as a secondary product from the hydrothermal alteration of feldspar, and as foliated masses (see FOLIATION) in metamorphic schists. It has been mined as a substitute for talc.
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Natrolite , natrolite Member of the zeolite group of minerals, with the formula Na2Al2Si3O10.2H2O; sp. gr. 2.2; hardness 5.0; white; massive, fibrous, or crystal… Secondary Productivity , Skip to main content
secondary productivity Metallurgy and Mining: Terms and Concepts , mine1 / mīn/ • possessive pron. used to refer to a thing or things belonging to or associated with the speaker: you go your way and I'll go mine some… Strip Mining , This technique is used for near-surface, relatively flat sedimentary mineral deposits. How deeply the mining can occur is essentially determined by t… Belong , be·long / biˈlông/ • v. [intr.] 1. (of a thing) be rightly placed in a specified position: learning to place the blame where it belongs. ∎ be rightly… realgar , realgar Minor sulphide ore for arsenic, As2S2, associated with orpiment (As2S3) to which realgar changes on exposure; sp. gr. 3.6; hardness 1.5–2.0 (…
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pyrophyllite