Chiavennite, CaMnBe2Si5O13(OH)2.2H2O, a new mineral from Chiavenna (Italy)

M. Bondi; W. L. Griffin; V. Mattioli; A. Mottana

Chiavennite, CaMnBe2Si5O13(OH)2.2H2O, a new mineral from Chiavenna (Italy)

M. Bondi, W. L. Griffin, V. Mattioli, A. Mottana

Research output: Contribution to journal › Article › peer-review

Abstract

Chiavennite, named for its type locality, occurs as euhedral orange grains and as crusts coating beryl in the Alpine pegmatites crossing the Chiavenna ultramafics in the Rhaetic Alps of Italy. With ideal formula CaMnBe₂Si₅O₁₃(OH)₂.2H₂O, chiavennite is optically biaxial and orthorhombic: P2₁ab, a 8.729(5), b 31.326(11), c 4.903(2) A, Z = 4, with D_calc. 2.657 g/cm³, D_meas. 2.64(1) g/cm³; alpha (colourless to pale yellow) 1.581(1), gamma (yellow-orange) 1.600(1). The most intense powder XRD reflections are: 15.7(100), 2.903(100), 3.28(75), 4.15(30), 3.93(30), 3.82(30), 1.944(30) A. Chiavennite appears to form in association with bavenite and other pegmatitic minerals as the result of late-phase fluid activity in pegmatites. (A.M. 68-628)-J.A.Z.

Original language	English
Pages (from-to)	623-627
Number of pages	5
Journal	American Mineralogist
Volume	68
Issue number	5-6
Publication status	Published - 1983
Externally published	Yes

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@article{c8ec54d958a14c26bf9e03981a84f4dd,

title = "Chiavennite, CaMnBe2Si5O13(OH)2.2H2O, a new mineral from Chiavenna (Italy)",

abstract = "Chiavennite, named for its type locality, occurs as euhedral orange grains and as crusts coating beryl in the Alpine pegmatites crossing the Chiavenna ultramafics in the Rhaetic Alps of Italy. With ideal formula CaMnBe2Si5O13(OH)2.2H2O, chiavennite is optically biaxial and orthorhombic: P21ab, a 8.729(5), b 31.326(11), c 4.903(2) A, Z = 4, with Dcalc. 2.657 g/cm3, Dmeas. 2.64(1) g/cm3; alpha (colourless to pale yellow) 1.581(1), gamma (yellow-orange) 1.600(1). The most intense powder XRD reflections are: 15.7(100), 2.903(100), 3.28(75), 4.15(30), 3.93(30), 3.82(30), 1.944(30) A. Chiavennite appears to form in association with bavenite and other pegmatitic minerals as the result of late-phase fluid activity in pegmatites. (A.M. 68-628)-J.A.Z.",

author = "M. Bondi and Griffin, {W. L.} and V. Mattioli and A. Mottana",

year = "1983",

language = "English",

volume = "68",

pages = "623--627",

journal = "American Mineralogist",

issn = "0003-004X",

publisher = "Mineralogical Society of America",

number = "5-6",

}

TY - JOUR

T1 - Chiavennite, CaMnBe2Si5O13(OH)2.2H2O, a new mineral from Chiavenna (Italy)

AU - Bondi, M.

AU - Griffin, W. L.

AU - Mattioli, V.

AU - Mottana, A.

PY - 1983

Y1 - 1983

N2 - Chiavennite, named for its type locality, occurs as euhedral orange grains and as crusts coating beryl in the Alpine pegmatites crossing the Chiavenna ultramafics in the Rhaetic Alps of Italy. With ideal formula CaMnBe2Si5O13(OH)2.2H2O, chiavennite is optically biaxial and orthorhombic: P21ab, a 8.729(5), b 31.326(11), c 4.903(2) A, Z = 4, with Dcalc. 2.657 g/cm3, Dmeas. 2.64(1) g/cm3; alpha (colourless to pale yellow) 1.581(1), gamma (yellow-orange) 1.600(1). The most intense powder XRD reflections are: 15.7(100), 2.903(100), 3.28(75), 4.15(30), 3.93(30), 3.82(30), 1.944(30) A. Chiavennite appears to form in association with bavenite and other pegmatitic minerals as the result of late-phase fluid activity in pegmatites. (A.M. 68-628)-J.A.Z.

AB - Chiavennite, named for its type locality, occurs as euhedral orange grains and as crusts coating beryl in the Alpine pegmatites crossing the Chiavenna ultramafics in the Rhaetic Alps of Italy. With ideal formula CaMnBe2Si5O13(OH)2.2H2O, chiavennite is optically biaxial and orthorhombic: P21ab, a 8.729(5), b 31.326(11), c 4.903(2) A, Z = 4, with Dcalc. 2.657 g/cm3, Dmeas. 2.64(1) g/cm3; alpha (colourless to pale yellow) 1.581(1), gamma (yellow-orange) 1.600(1). The most intense powder XRD reflections are: 15.7(100), 2.903(100), 3.28(75), 4.15(30), 3.93(30), 3.82(30), 1.944(30) A. Chiavennite appears to form in association with bavenite and other pegmatitic minerals as the result of late-phase fluid activity in pegmatites. (A.M. 68-628)-J.A.Z.

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VL - 68

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EP - 627

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SN - 0003-004X

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