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Limonite (/ ˈlaɪməˌnaɪt /) is an iron ore consisting of a mixture of hydrated iron (III) oxide-hydroxides in varying composition. The generic formula is frequently written as FeO (OH)·nH2O, although this is not entirely accurate as the ratio of oxide to hydroxide can vary quite widely. Limonite is one of the three principal iron ores, the ...
Luminous gemstones. Folktales about luminous gemstones are an almost worldwide motif in mythology and history among Asian, European, African, and American cultures. Some stories about light-emitting gems may have been based on luminescent and phosphorescent minerals such as diamonds.
In the U.S., during 2020, when adoption rates spiked, 2% more animals left shelters than arrived, according to Shelter Animals Count. However, by 2021, that figure reversed—2% more animals ...
Print/export Download as PDF; Printable version; In other projects ... There are over 300 types of minerals that have been used as gemstones. Such as: A–B
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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 containing amethyst and citrine, from Bolivia.
Print/export Download as PDF; Printable version; ... Pages in category "Animals described in 2021" The following 36 pages are in this category, out of 36 total.
Selenide minerals. Selenide minerals are those minerals that have the selenide anion as a main component. Selenides are similar to sulfides and often grouped with them. [1] Examples include: achavalite Fe. 1-xSe. athabascaite Cu5Se4. clausthalite PbSe.