2 Elk Creek (SD), Teyler's Museum, Ramsbeckite, Neotocite, Phosphosiderite
Secondary phosphates found in the Stewart pegmatite include hureaulite, sicklerite, purpurite, heterosite, stewartite, and phosphosiderite.
These include sicklerite, purpurite, hureaulite, phosphosiderite, strengite, stewartite, eosphorite, robertsite, mitridatite, jahnsite, fairfieldite, hopeite, and pseudomalachite.
The mine has produced an interesting suite of minerals in recent years, including pale blue to green aquamarine, alpine-like smoky quartz crystals, spessartine, danburite, columbite, cassiterite, helvite, and numerous phosphates including apatite, lithiophilite, purpurite, herderite, strengite, phosphosiderite, hureaulite, robertsite, eosphorite, frondelite and mitridatite (A.
Minerals in the pegmatite are: quartz, microcline, muscovite, albite, amblygonite, "apatite," beryl, uraninite, elbaite, members of the tantalite group, secondary uranium minerals, triphylite, triplite, purpurite, rockbridgeite, tavorite, barbosalite, hureaulite, eosphorite, phosphosiderite
, carlhintzeite, colquirite, pachnolite, ralstonite and fluellite.
Correia Neves and Lopes Nunes (1968) described bermanite, eosphorite, variscite, phosphosiderite, hureaulite, montebrasite, fluorapatite, amblygonite, and triplite from Alto Ligonha pegmatites.
Correia Neves and Lopes Nunes (1968) described eosphorite, variscite, phosphosiderite, hureaulite, montebrasite, fluorapatite, amblygonite, triplite and bermanite from Alto Ligonha pegmatites.
Correia Neves and Lopes Nunes (1968) described hureaulite, montebrasite, fluorapatite, amblygonite, triplite, phosphosiderite, variscite, eosphorite and bermanite from Alto Ligonha pegmatites.
Similar excavations on the west side of the core encountered plentiful secondary phosphates (mainly mitridatite, variscite and phosphosiderite with johnsomervilleite) in feldspar boxworks.
Vein deposition of montebrasite, pyrite, quartz, sphalerite, tourmaline and zircon coexists with replacements of triphylite (usually along cleavages) by heterosite, barbosalite, frondelite, jahnsite, phosphosiderite, rockbridgeite, tavorite and manganese oxides.
The frondelite assemblage consists of residual heterosite, [TABULAR DATA FOR TABLE 1 OMITTED] montebrasite and triphylite enclosed by frondelite; massive replacement of frondelite by cyrilovite, cryptomelane and leucophosphite; and fracture coatings in frondelite of bermanite, cyrilovite, goethite, leucophosphite, lipscombite, mitridatite, moraesite, opal, phosphosiderite, rockbridgeite, variscite and manganese oxides.
And in December of 1993 there were collected at the Williams Prospect, Coosa County, Alabama, some 20 hand-sized chunks of brown altered phosphate pegmatite matrix with bright purple areas of microcrystals of phosphosiderite
, plus other rare phosphate secondaries.