Jasper & botryoidal jasper (Utah, USA) 11 : 無料・フリー素材/写真
Jasper & botryoidal jasper (Utah, USA) 11 / 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 | "Jasper" is a reddish-colored, opaque, cryptocrystalline, quartzose rock. The reddish coloration is from hematite (Fe2O3 - iron oxide). The term "jasper" is also used by rockhounds and lapidarists for many types of non-reddish rocks. The surfaces of this rock are naturally abraded and polished by wind-blown sand.The small blister-like structures are botryoidal jasper. Rockhounds refer to this type of rock as "red grape agate", in reference to the grape-like shape of the small surficial pustules. This material is not agate.Geologic context: unrecorded / undisclosed (but possibly from a Jurassic-aged stratigraphic unit - maybe the Curtis Formation or the Summerville Formation)Locality: unrecorded / undisclosed site in Utah, USA (but possibly from the San Rafael Reef - San Rafael Swell area of eastern Utah) |
| 撮影日 | 2022-11-02 21:58:57 |
| 撮影者 | James St. John |
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