Cebollite Mineral Data

Cebollite Mineral Data

General Cebollite Information

Chemical Formula:

Ca5Al2(SiO4)3(OH)4

Composition:

Molecular Weight = 598.63 gm

Calcium 33.47 % Ca 46.84 % CaO

Aluminum 9.01 % Al 17.03 % Al₂O₃

Silicon 14.07 % Si 30.11 % SiO₂

Hydrogen 0.67 % H 6.02 % H₂O

Oxygen 42.76 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₅Al₂(SiO₄)₃(OH)₄

Environment:

Alteration product of melilite.

IMA Status:

Valid Species (Pre-IMA) 1914

Locality:

Cebolla Creek, Gunnison Co., Colorado Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Cebollite Image

Images:

Cebollite

Comments: Green to white fibrous coating of cebollite on granular iron stained quartz.
Location: Cebola Creek, Gunnison County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Cebollite Crystallography

Crystal System:

OrthorhombicSpace Group: Unk

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

By Intensity(I/I_o): 2.73(1), 2.88(0.9), 2.59(0.7),

Physical Properties of Cebollite

Color:

Colorless, Greenish gray, White, Light brown.

Density:

2.96

Diaphaniety:

Subtranslucent to opaque

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

5 - Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Dull

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Cebollite

Gladstone-Dale:

CI meas= 0.053 (Good) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2053,KC= 0.2167

Optical Data:

Biaxial (+), a=1.595, b=1.6, g=1.628, bire=0.0330

Calculated Properties of Cebollite

Electron Density:

r_electron=2.97 gm/cc
note: r_Cebollite=2.96 gm/cc.

Fermion Index

Fermion Index = 0.00723
Boson Index = 0.99277

Photoelectric:

PE_Cebollite= 4.90 barns/electron
U=PE_Cebollite x r_electron= 14.55 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cebollite is Not Radioactive

Cebollite Classification

Dana Class:

78.1.1.1 (78)Unclassified silicates

(78.1)possible nesosilicates

(78.1.1)Dana Group

78.1.1.1 Cebollite Ca5Al2(SiO4)3(OH)4 Unk Ortho

Strunz Class:

VIII/C.03-30 VIII - Silicates

VIII/C - Sorosilicates, with [Si2O7]6-, without anions unfamiliar to tetraheders

VIII/C.03 - Rankinite - Cebollite series

VIII/C.03-10 Rankinite Ca3Si2O7 P 2₁/a 2/m

VIII/C.03-20 Kilchoanite Ca3Si2O7 I2cm mm2

VIII/C.03-30 Cebollite Ca5Al2(SiO4)3(OH)4 Unk Ortho

VIII/C.03-58 Manganokukisvumite! Na6MnTi4Si8O28·4(H2O) Pccn 2/m 2/m 2/m

Other Cebollite Information

References:

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

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Print or Cut-and-Paste your Cebollite Specimen Label here :

Cebollite

Ca5Al2(SiO4)3(OH)4
Dana No: 78.1.1.1 Strunz No: VIII/C.03-30
Locality:

Notes: