Uraninite rock (Witwatersrand Supergroup, Neoarchean, ~2.9 Ga; Witwatersrand, South Africa) 1 : 無料・フリー素材/写真
Uraninite rock (Witwatersrand Supergroup, Neoarchean, ~2.9 Ga; Witwatersrand, South Africa) 1 / 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 | Uraninite rock from the Precambrian of South Africa.The Witwatersrand area of South Africa has produced much of the world's gold from 2.9 billion year old quartz-pebble conglomerates and uraninitic horizons. The rock seen here is an example of the latter. The black material is radioactive uraninite, UO2 - uranium dioxide (also referred to as "pitchblende). Visible native gold can occur in this black uraninite-rich rock.Stratigraphy: Witwatersrand Supergroup, lower Neoarchean, ~2.9 Ga (possibly from the Carbon Leader Member in the Main Conglomerate, lower Johannesburg Subgroup, lower Central Rand Group)Locality: unrecorded / undisclosed site attributed to "Witwatersrand", South Africa. |
| 撮影日 | 2025-04-05 11:36:19 |
| 撮影者 | James St. John |
| タグ | |
| 撮影地 |