The thin, wedge-terminated, transparent brown blades of Lavra do Poco Dantes childrenite form loose, delicate clusters, some with red-brown microcrystals of roscherite
, with individual childrenite crystals reaching 3 cm.
Two commonly associated species are eosphorite-childrenite, in well-formed, transparent crystal aggregates, and spheres of brown roscherite
and green zanazziite, both perched on the rose quartz.
Associated minerals are: albite, potassic feldspar, roscherite, viitaniemiite, childrenite, quartz, apatite, herderite, elbaite and montmorillonite.
Relationship to other species: It is the [Fe.sup.2+]-dominant member of the roscherite group.
From Brazil the Lavra da Ilha pegmatite in the middle of the Jequitinhonha River had yielded some fine rose quartz crystal clusters, many of them sprinkled with tiny, lustrous brown eosphorite and roscherite
The crystals are sprinkled attractively over white crystalline to massive albite/amblygonite, some specimens showing incomplete crystals of dark green elbaite and/or microcrystals of the rare species roscherite
, zanazziite and greifensteinite.
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.
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.
Childrenite occurs at Sapucaia as pale honey-colored crystals associated with roscherite in pockets in muscovite, and with phosphosiderite and variscite in albite made vesicular as a result of triphylite leaching.
Sapucaia is the type locality for faheyite (Lindberg and Murata, 1953), where it occurs as matted and radiating groups and masses of acicular, white to bluish white and brownish white fibers coating roscherite, frondelite, variscite and quartz (Lindberg and Pecora, 1958).
Accompanying minerals such a roscherite
and eosphorite are highly characteristic of this occurrence.
Associated minerals: albite, quartz, manganoan almandine, muscovite, siderite, fluorapatite, elbaite, lepidolite, beryl, montebrasite, rhodochrosite, cassiterite, manganocolumbite, uraninite, lollingite, zircon, eosphorite, moraesite, ferroan roscherite