frondelite

frondelite

[frän′de‚līt]
(mineralogy)
MnFe4(PO4)5(OH)5 A mineral composed of basic phosphate of manganese and iron; it is isomorphous with rockbridgeite.
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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.
The Sapucaia pegmatite is famous as the type locality for six phosphate species: barbosalite, faheyite, frondelite, lipscombite, moraesite and tavorite.
Large phosphate pebbles and boulders are often exposed in the creek bed after heavy rains; these are generally massive triphylite or frondelite, with or without alteration minerals, or heterosite sometimes showing good crystals.
Seven new mineral species were described from this material: lipscombite (Lindberg, 1962), frondelite (Lindberg, 1949), faheyite (Lindberg and Murata, 1953), moraesite (Lindberg et al.
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).
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.
The silicate assemblage consists of altered albite as a host for apatite, hureaulite, goethite, gordonite, leucophosphite, phosphosiderite, rockbridgeite, saleeite, tourmaline and variscite; altered beryl as host for faheyite, moraesite, roscherite and variscite, and muscovite hosting replacements and vug fillings of apatite, bermanite, childrenite, faheyite, frondelite, montebrasite, roscherite and variscite.
Augelite occurs very rarely as thin veinlets in frondelite, sometimes in association with vivianite.
Irregular veinlets of white coarse-grained berlinite occur intersecting frondelite (R.
Bermanite occurs as reddish brown to terra cotta-red crystals and aggregates lining vugs in frondelite and spongy feldspar.
The former are associated with a well-crystallized, gray reddingite-like mineral, triphylite, vivianite and frondelite, and are available from both Luis Menezes and Carlos Barbosa (Rue Cell Roberto Soares Ferreira 586, Bairro Vila Bretas, 35030 Governador Valaderes, Minas Gerais, Brazil).