Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 24 : 無料・フリー素材/写真
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 24 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
|---|---|
| 説明 | Agate nodule from Kentucky, USA.This is the interior of an agate nodule. "Agate" is a rockhound/collector term for irregularly- & concentrically-layered masses of microcrystalline quartz. Individual layers consist of translucent or opaque, microcrystalline, fibrous quartz called chalcedony. Impurities in different layers cause variations in color. Many agate masses are simply geodes that have completely filled up with quartz. Common agate colors are clearish-whitish-grayish, brownish-red, and yellowish-brown. Commercial agates that occur in greens and blues and purples are almost always dyed (faked).Geologic context: nodule hosted in the Nada Member, Borden Formation, Lower MississippianLocality: unrecorded/undisclosed site in Powell County, eastern Kentucky, USA |
| 撮影日 | 2025-04-26 16:51:08 |
| 撮影者 | James St. John |
| タグ | |
| 撮影地 |