The diaspore crystals and associated minerals in the paragenesis, such as muscovite, chloritoid, donbassite, ilmenite, and specular hematite, are also unique with regard to their origin. They were formed as remobilized secondary mineralization in fracture zones that cross-cut a karst unconformity-...
The diaspore crystals and associated minerals in the paragenesis, such as muscovite, chloritoid, donbassite, ilmenite, and specular hematite, are also unique with regard to their origin. They were formed as remobilized secondary mineralization in fracture zones that cross-cut a karst unconformity-...
It is covered with blackish ocellated spots and blotches, which are variously arranged. The ground color varies from reddish gray to tawny yellow. Ocher (n.) Alt. of Ochre Ochre (n.) A impure earthy ore of iron or a ferruginous clay, usually red (hematite) or yellow (limonite), -- ...
Possible contributors to the source of geologically stable remanence in red beds include(1) detrital hematite or specularite,(2) detrital magnetite that has experienced in situ oxidation,and (3) fine pigment hematite, or other form of non-detrital "secondary" hematite,with a wide range of grain...