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The mica in recent volcanic rocks, gabbros, and diorites is usually Biotite, while that so common in metamorphic limestones is usually, if not always, Phlogopite. Amphibole is a general name for all the different varieties of Hornblende, Actinolite, Tremolite, etc., while Pyroxene includes Augite, Diallage, Malacolite, Sahlite, etc.
Tridymite: 100.0 2.3. Orthoclase. Orthoclase. Albite. Oligoclase. Oligoclase. Labradorite. Labradorite. Anorthite. Anorthite. Leucite. Nepheline. Nepheline. Muscovite. Lepidolite. Li 4.85. Biotite. Biotite. Phlogopite. Margarite. Chlorite. Rapidolite. Talc. 63.00 .... .... trace .... 33.60 .... .... W 3.10 2.78. Tremolite. St. Actinolite. Hornblende. Uralite. Augite. Augite. Diallage.
Among these black schorl or tourmaline, actinolite, zircon, garnet, and fluor spar are not uncommon; but they are too sparingly dispersed to modify the general aspect of the rock. They show, nevertheless, that the ingredients were not everywhere exactly the same; and a still greater difference may be traced in the ever-varying proportions of the feldspar, quartz, and mica.
ACTINOLITE SCHIST is a slaty foliated rock, composed chiefly of actinolite, an emerald-green mineral, allied to hornblende, with some admixture of garnet, mica, and quartz. MICA-SCHIST or MICACEOUS SCHIST is, next to gneiss, one of the most abundant rocks of the metamorphic series. It is slaty, essentially composed of mica and quartz, the mica sometimes appearing to constitute the whole mass.
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