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Chlorastrolite, also known as Isle Royale Greenstone, is a green or bluish green stone. [1] Chlorastrolite has finely radiating or stellate (for examples, see crystal habits) masses that have a "turtleback" pattern. The stellate masses tend to be chatoyant, meaning they have a varying luster. This chatoyancy can be subtranslucent to opaque.
Native copper and chlorastrolite, the official state gem of Michigan, are secondary minerals filling pore spaces formed by vesicles and fractures within the volcanic rocks. Prehnite and agate amygdules are also plentiful island gemstones. [15]: 55, 58–61
El Señor de las Limas, the largest known greenstone sculpture, Xalapa Museum Greenstone staff, 1550 - 1600 AD, from the Tairona culture of present-day Colombia.. Greenstone is a common generic term for valuable, green-hued minerals and metamorphosed igneous rocks and stones which early cultures used in the fashioning of hardstone carvings such as jewelry, statuettes, ritual tools, and various ...
Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc.
Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...
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A - J A. Abelsonite [i] Abenakiite-(Ce) [i] Actinolite Alabaster Albite Alforsite [i] Altaite Alunite [i] Amazonite Amber Amblygonite [i] Amethyst Amphibole Anatase [i] Andalusite Anglesite [i] Anorthite [i] Aquamarine Aragonite Arfvedsonite [i] Armalcolite [i] Asbestos Aventurine [i] Azurite
Pumpellyite is a group of closely related sorosilicate minerals: . pumpellyite-(Mg): Ca 2 MgAl 2 [Si 2 O 6 OH][SiO 4](OH) 2 (OH) [4] pumpellyite-(Fe2+): Ca 2 Fe 2+ Al 2 [Si 2 O 6 OH][SiO 4](OH) 2 (OH) [5]