Cebollite Mineral Data

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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

Diaphaneity:

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
Ncalc = 1.64

Optical Data:

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

Calculated Properties of Cebollite

Electron Density:

Bulk Density (Electron Density)=2.97 gm/cc
note: Specific Gravity of Cebollite =2.96 gm/cc.

Fermion Index:

Fermion Index = 0.0072311321
Boson Index = 0.9927688679

Photoelectric:

PE_Cebollite= 4.90 barns/electron
U=PE_Cebollite x rElectron Density= 14.55 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cebollite is Not Radioactive

Cebollite Classification

Dana Class:

78.01.01.01 (78)Unclassified silicates

(78.01)possible nesosilicates

(78.01.01)Dana Group

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

Strunz Class:

09.BB.10 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BB -Si2O7 groups, without non-tetrahedral anions;

09.BB.10 Akermanite Ca2MgSi2O7 P 42₁m 4 2m

09.BB.10 Cebollite Ca5Al2(SiO4)3(OH)4 Unk Ortho

09.BB.10 Gugiaite Ca2BeSi2O7 P 42₁m 4 2m

09.BB.10 Gehlenite Ca2Al(AlSi)O7 P 42₁m 4 2m

09.BB.10 Jeffreyite (Ca,Na)2(Be,Al)Si2(O,OH)7 C 222₁ 2 2 2

09.BB.10 Hardystonite Ca2ZnSi2O7 P 42₁m 4 2m

09.BB.10 Melilite (Ca,Na)2(Al,Mg,Fe)(Si,Al)2O7 P 42₁m 4 2m

09.BB.10 Okayamalite! Ca2B2SiO7 P 42₁m 4 2m

Other Cebollite Information

References:

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

See Also:

Links to other databases for Cebollite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Cebollite

Ca5Al2(SiO4)3(OH)4
Dana No: 78.01.01.01 Strunz No: 09.BB.10
Locality:

Notes: