Clinochlore Mineral Data

General Clinochlore Information

Chemical Formula:

(Mg,Fe++)5Al(Si3Al)O10(OH)8

Composition:

Molecular Weight = 595.22 gm

Magnesium 15.31 % Mg 25.39 % MgO

Aluminum 9.07 % Al 17.13 % Al₂O₃

Iron 11.73 % Fe 15.09 % FeO

Silicon 14.16 % Si 30.28 % SiO₂

Hydrogen 1.35 % H 12.11 % H₂O

Oxygen 48.38 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg_3.75Fe²⁺_1.25Si₃Al₂O₁₀(OH)₈

Environment:

Contact, hydrothermal, and regional metamorphism of mafic minerals.

IMA Status:

Valid Species (Pre-IMA) 1851

Locality:

Common world wide. Link to MinDat.org Location Data.

Name Origin:

Clinochlore from the Greek klino - "oblique" and chloros - " green." Ripidolite from the Greek rhipis - "fan" and lithos - "stone." Pennine from the Pennine Alps, Italy

Name Pronunciation:

Clinochlore + Pronunciation

Synonym:

Colerainite

Kammererite - Red

Maufite - interstratified clinochlore-lizardite

Pennine

Prochlorite

Ripidolite

Sheridanite

Clinochlore Image

Images:

Andradite Clinochlore

Comments: Transparent topazolite, the yellow variety of andradite on clinochlore.
Location: Yellow Cat Mine, New Idria District, San Benito County. California, USA. Scale: 2.7 x 2.5 cm.
© Fabre Minerals

Images:

Clinochlore

Comments: Purple clinochlore (Kammererite) crystal cluster.
Location: Kop Daglari, Turkey. Scale: 1.4 cm across.
© John Veevaert

Images:

Perovskite Clinochlore

Comments: Square, opaque perovskite on green clinochlore. Very brilliant and with large crystals (2 x 1.5 cm.).
Location: Ilmen Mountains. Chelyabinsk, Urals, Russia. Scale: 6 x 4.5 cm.
© Fabre Minerals

Clinochlore Crystallography

Axial Ratios:

a:b:c =0.5698:1:1.5376

Cell Dimensions:

a = 5.3, b = 9.3, c = 14.3, Z = 2; beta = 97° V = 699.59 Den(Calc)= 2.83

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 7.16(1), 4.77(0.7), 3.58(0.6),

Physical Properties of Clinochlore

Cleavage:

{001} Perfect

Color:

Blackish green, Bluish green, White, Yellowish green, Olive green.

Density:

2.55 - 2.75, Average = 2.65

Diaphaneity:

Transparent to translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

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

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

2-2.5 - Gypsum-Finger Nail

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Clinochlore

Gladstone-Dale:

CI meas= -0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.059 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2058,KPDmeas= 0.2197,KC= 0.2188
Ncalc = 1.56 - 1.62

Optical Data:

Biaxial (+), a=1.571-1.588, b=1.571-1.589, g=1.576-1.599, bire=0.0050-0.0110, 2V(Calc)=0-36, 2V(Meas)=0-40. Dispersion r < v.

Pleochroism (x):

pale green, pale green, or colorless.

Pleochroism (y):

pale green, pale green, or colorless.

Calculated Properties of Clinochlore

Electron Density:

Bulk Density (Electron Density)=2.65 gm/cc
note: Specific Gravity of Clinochlore =2.65 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Clinochlore= 4.59 barns/electron
U=PE_Clinochlore x rElectron Density= 12.16 barns/cc.

Radioactivity:

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

Clinochlore Classification

Dana Class:

71.04.01.04 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.04)interlayered 1:1, 2:1, and octahedra

(71.04.01)Chlorite group (Tri-Dioctahedral)

71.04.01.01 Donbassite Al2[Al2.33][Si3AlO10](OH)8 C 2/m 2/m

71.04.01.02 Cookeite LiAl4(Si3Al)O10(OH)8 P 2₁/a 2/m

71.04.01.03 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m

71.04.01.04 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

71.04.01.05 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

71.04.01.06 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri

71.04.01.07 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m

71.04.01.08 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m

71.04.01.09 Orthochamosite! (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho

71.04.01.10 Borocookeite! Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m

Strunz Class:

09.EC.55 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets

09.EC.55 Donbassite Al2[Al2.33][Si3AlO10](OH)8 C 2/m 2/m

09.EC.55 Baileychlore (Zn,Al,[])3[Fe2Al][Si3AlO10](OH)8 C1,C1 Tri

09.EC.55 Clinochlore (Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

09.EC.55 Cookeite LiAl4(Si3Al)O10(OH)8 P 2₁/a 2/m

09.EC.55 Chamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C 2/m 2/m

09.EC.55 Franklinfurnaceite Ca2(Fe,Al)MnMn3Zn2Si2O10(OH)8 C 2 2

09.EC.55 Nimite (Ni,Mg,Fe)5Al(Si3Al)O10(OH)8 C 2/m 2/m

09.EC.55 Gonyerite Mn3[Mn3Fe][(Si,Fe)4O10](OH,O)8 pseudo-HEX Ortho

09.EC.55 Odinite (Fe,Mg,Al,Fe,Ti,Mn)2.5(Si,Al)2O5(OH)4 Cm m

09.EC.55 Orthochamosite (Fe,Mg,Fe)5Al(Si3Al)O10(OH,O)8 C3m-pseudoHEX Ortho

09.EC.55 Pennantite Mn5Al(Si3Al)O10(OH)8 C 2/m 2/m

09.EC.55 Sudoite Mg2(Al,Fe)3Si3AlO10(OH)8 C 2/m 2/m

09.EC.55 Glagolevite! NaMg6[Si3AlO10](OH,O)8•H2O C1 1

09.EC.55 Borocookeite! Li(13x)Al(4-x)(BSi3)O10(OH,F)8[x=0-0.33] pseudo C 2/m 2/m

Other Clinochlore Information

See Also:

Links to other databases for Clinochlore :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - Franklin Minerals(Dunn)
9 - GeoScienceWorld
10 - Google Images
11 - Google Scholar
12 - Handbook of Mineralogy (MinSocAm)
13 - Handbook of Mineralogy (UofA)
14 - MinDAT
15 - Mineral and Gemstone Kingdom
16 - Mineralienatlas (Deutsch)
17 - Online Mineral Museum
18 - QUT Mineral Atlas
19 - Ruff.Info
20 - WWW-MINCRYST

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Clinochlore

(Mg,Fe++)5Al(Si3Al)O10(OH)8
Dana No: 71.04.01.04 Strunz No: 09.EC.55
Locality:

Notes:

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