Location: |
Metamorphosed manganese ore. Gwynedd, Wales, Britain |
Major Minerals: |
Calcian rhodochrosite, spessartine garnet |
Minor Minerals: |
Magnetite, haematite,- pyrite, rhodonite, rhodochrosite, limonite, psilomelane, siderite |
Trace Minerals: |
Include chalcopyrite, ferropyrophanite |
Textures: |
Radiating and zoned microconcretions of manganese-bearing carbonates have been replaced by limonite and psilomelane. Euhedral magnetite shows incipient martitization. |
References: |
Mohr, 1964; Bennett, 1987 |