Glaucochroite Mineral Data

Glaucochroite Mineral Data +

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General Glaucochroite Information

Chemical Formula:

CaMnSiO4

Composition:

Molecular Weight = 187.10 gm

Calcium 21.42 % Ca 29.97 % CaO

Manganese 29.36 % Mn 37.91 % MnO

Silicon 15.01 % Si 32.11 % SiO₂

Oxygen 34.21 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMn²⁺SiO₄

Environment:

Metamorphosed limestone containing manganese minerals.

IMA Status:

Valid Species (Pre-IMA) 1899

Locality:

Franklin Furnace, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.

Synonym:

ICSD 100650

PDF 14-376

Glaucochroite Image

Images:

Click Here for Larger Glaucochroite Image

Glaucochroite Zincite Willemite

Comments: Pinkish gray crystalline glaucochroite intermixed with pale green willemite, with dark red zincite and white calcite.
Location: Franklin, Sussex County, New Jersey, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Glaucochroite Crystallography

Axial Ratios:

a:b:c =0.4416:1:0.5834

Cell Dimensions:

a = 4.92, b = 11.14, c = 6.5, Z = 4; V = 356.26 Den(Calc)= 3.49

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbnm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.85(1), 2.63(0.8), 2.69(0.8),

Crystal Structure:

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Lager G A , Meagher E P , American Mineralogist , 63 (1978) p.365-377, High-temperature structural study of six olivines, T = 25 deg C

View Additional jPOWD Structure files for Glaucochroite
[1] [2] [3]

Physical Properties of Glaucochroite

Cleavage:

[001] Indistinct

Color:

Green, White, Pinkish.

Density:

3.4

Diaphaniety:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

6 - Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Glaucochroite

Gladstone-Dale:

CI meas= -0.024 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2039,KPDmeas= 0.2093,KC= 0.2044

Optical Data:

Biaxial (-), a=1.679-1.686, b=1.716-1.723, g=1.729-1.736, bire=0.0500, 2V(Calc)=60, 2V(Meas)=61. Dispersion medium, r > v.

Calculated Properties of Glaucochroite

Electron Density:

r_electron=3.39 gm/cc
note: r_{Glaucochroite}=3.49 gm/cc.

Fermion Index

Fermion Index = 0.00746
Boson Index = 0.99254

Photoelectric:

PE_{Glaucochroite}= 10.73 barns/electron
U=PE_{Glaucochroite} x r_electron= 36.42 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Glaucochroite is Not Radioactive

Glaucochroite Classification

Dana Class:

51.3.2.3 (51)Nesosilicate Insular SiO4 Groups Only

(51.3)with all cations in octahedral [6] coordination

(51.3.2)Monticellite - Kirschsteinite series

51.3.2.1 Monticellite CaMgSiO4 P nma 2/m 2/m 2/m

51.3.2.2 Kirschsteinite CaFeSiO4 Pbmn 2/m 2/m 2/m

51.3.2.3 Glaucochroite CaMnSiO4 Pbnm 2/m 2/m 2/m

Strunz Class:

VIII/A.05-30 VIII - Silicates

VIII/A - Nesosilicates with [SiO4]4-groups, cations of octahedral orientation [6]

VIII/A.05 - Monticellite - Glaucochroite series

VIII/A.05-10 Monticellite CaMgSiO4 P nma 2/m 2/m 2/m

VIII/A.05-20 Kirschsteinite CaFeSiO4 Pbmn 2/m 2/m 2/m

VIII/A.05-30 Glaucochroite CaMnSiO4 Pbnm 2/m 2/m 2/m

Other Glaucochroite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)

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Glaucochroite

CaMnSiO4
Dana No: 51.3.2.3 Strunz No: VIII/A.05-30
Locality:

Notes: