Tumbled Gemstone Identification Chart Provided by …
Tumbled Gemstone Identification Chart Provided by RockTumbler.com Amazonite Apache Tears Apricot Agate Banded Amethyst Carnelian Black Bloodstone Chalcedony Blue
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Identification Tables for Common Minerals in Thin Section
funnel.sfsu.edulabradorite (plagioclase) IM colourless 1.55-1.57 low + 28-39 (Michel-Levy) 70-90, -ve or +ve low : up to white Albite twins along length, also Carlsbad + others In igneous rocks often with clinopyroxene and or olivine. Also in high-grade meta rocks. Crystals in igneous rocks often rectangular laths. Often zoned:
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