The book Mineralogy was written by author F H Frederick Henry Hatch Here you can read free online of Mineralogy book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Mineralogy a good or bad book?
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MICA- may be conveniently separated into CRYSTAL. i i i j ji i -i Basal plane- M two broad subdivisions: the white or prism- A clino- light-coloured. And the black or dark- pinacoid;'*, clino- dome. coloured varieties. Chief among the former is muscovite, or potash-mica, which is essenti- ally a hydrated silicate of alumina and potash. This variety of mica is not attacked by hydrochloric acid. It is generally pale-coloured to silvery white, with pearly lustre on the cleavage surfaces. It occurs... in flakes, scales, and laminae, in many granites, gneisses, and phyllites. Fragments are often present in sand- stones and shales (derived, no doubt, originally from granitic rocks) ; and by their parallel arrangement impart to these rocks a fissile character. 100 DESCRIPTIVE MINERALOGY Less common than muscovite are the following light- coloured micas : Paragonite, or soda-mica. Lepidolite, or lithia-mica. Biotite. The most important dark mica ; essentially a hydrated ferro-magnesian and aluminous silicate.
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