Secondary phosphates found in the Stewart pegmatite include hureaulite, sicklerite, purpurite, heterosite, stewartite, and phosphosiderite. Apatite appears to be rare.
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.
Correia Neves and Lopes Nunes (1968) described montebrasite, fluorapatite, amblygonite, triplite, hureaulite, phosphosiderite, variscite, eosphorite and bermanite from Alto Ligonha pegmatites.
Summing up their work on Sapucaia phosphates, Lindberg and Pecora (1958) listed their apatite, bermanite, childrenite, gordonite, heterosite, hureaulite, leucophosphite, lipscombite, metastrengite (= phosphosiderite), montebrasite, roscherite, saleeite, strengite, triphylite, variscite and vivianite as having been positively identified, in addition to the new species.
Similar excavations on the west side of the core encountered plentiful secondary phosphates (mainly mitridatite, variscite and phosphosiderite with johnsomervilleite) in feldspar boxworks.
During the summer of 1982 a forest fire uncovered old phosphate stockpiles near the access road close to the ford (fine frondelite and heterosite and excellent phosphosiderite).
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.