Gypsum (Santa Eulalia, Mexico) 2 : 無料・フリー素材/写真
Gypsum (Santa Eulalia, Mexico) 2 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Gypsum helictite from Mexico. (Wayne State University collection, Detroit, Michigan, USA)Gypsum is a moderately common hydrous calcium sulfate mineral (CaSO4·2H2O). Gypsum has a nonmetallic luster, is usually clearish to whitish, is soft (H≡2), and rather fragile / brittle. Gypsum has 3 cleavage planes, one of which is well developed (“one good cleavage"), and the other two are not well developed (“two poor cleavages”). Broken gypsum specimens are frequently thin plates - the consequence of the one good cleavage plane. Unbroken crystals show monoclinic symmetry.Seen here is a gypsum helictite, a twisted type of speleothem ("cave formation").Locality: unrecorded / undisclosed site in the Santa Eulalia Mining District, Chihuahua State, northern Mexico------------------------------------------Photo gallery of gypsum:www.mindat.org/gallery.php?min=1784 |
| 撮影日 | 2025-04-26 13:25:38 |
| 撮影者 | James St. John |
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