Example: tourism industry
Labradorite
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Les minéraux et les roches
mern.gouv.qc.caCristal de labradorite 4 faces latérales de parallélogramme 2 bases losangiques Structure cristalline de la labradorite (CaAl 2Si 2O 8) Système cristallin Généralement, lorsque les cristaux se développent sans contrainte dans la nature ils vont prendre la
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:
Tumbled Gemstone Identification Chart Provided by …
rocktumbler.comTumbled Gemstone Identification Chart Provided by RockTumbler.com Amazonite Apache Tears Apricot Agate Banded Amethyst Carnelian Black Bloodstone Chalcedony Blue