Web Reference: Note the variable interference colors (XP), caused by variable thickness of the biotite grain. This biotite is armored (surrounded) by magnetite (black, opaque mineral) and lots of quartz and plagioclase. Biotite, with more Fe-rich compositions is common in dacitic, rhyolitic, and trachytic volcanic rocks, granitic plutonic rocks, and a wide variety of metamorphic rocks. Objective: To determine the refractive indices, birefringence, pleochroism, and optical sign of biotite using a petrographic microscope. Examine the biotite thin section under plane-polarized light (PPL). Rotate the microscope stage and observe any changes in color.
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They're finally here, the Morphsuit Glow Range, a.k.a The Raver Range. Stand out amongst the crowd EVEN MORE with our new Glow suits. Glows under...
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color style guide
Source ID: e6OO_HTOY2M
Category: color style guide
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