cronstedtite


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cronstedtite

[′krän‚sted‚īt]
(mineralogy)
Fe42+Fe23+(Fe23+Si2)O10(OH)8 A black to brownish-black mineral consisting of a hydrous iron silicate crystallizing in hexagonal prisms; specific gravity is 3.34-3.35.
References in periodicals archive ?
Reddish to brown, gum-like amorphous masses of hisingerite are common at Llallagua, sometimes associated with cronstedtite.
Associated minerals are pyrite, pyrrhotite, siderite and cronstedtite in a brownish clay matrix.
Hunanui has also been the source of a number of other fine specimens, available from Alfred, Rock Currier (Jewel Tunnel Imports) and others: large vivianite crystals; superb large (to 4 x 4 cm) parallel groupings of lime green ludlamite crystals on pyrite, siderite, and vivianite matrix; lustrous ferberite V-twins (to 15 x 15 cm) and several specimens (to 7 x 5 cm) of openly branched cronstedtite crystals (to 5 mm) on matrix were also offered.
Saura also had a selection of less common Spanish minerals, including ludlamite crystals to 5 mm (some with associated vivianite crystals) and groups of cronstedtite from the Brunita mine, La Union district.