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American Mineralogist; June 1983; v. 68; no. 5-6; p. 623-627
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Chiavennite, CaMnBe 2 Si 5 O 13 (OH) 2 .2H 2 O, a new mineral from Chiavenna (Italy)

Mirella Bondi, William L. Griffin, Vittorio Mattioli, and Annibale Mottana

Univ. Bologna, Ist. Mineral. e Petrogr., Bologna, Italy

Occurs as euhedral orange grains and as crusts coating beryl in Alpine pegmatites. Usually associated with bavenite. Optically biaxial, faintly pleochroic. Orthorhombic, P2 1 ab, with a = 8.729(5), b = 31.326(11), c = 4.903(2) angstrom, Z = 4. Genesis is related to late fluid activity within the pegmatite.--Modified journal abstract.

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