Carpholite Mineral Data

General Carpholite Information

Chemical Formula:

MnAl2Si2O6(OH)4

Composition:

Molecular Weight = 329.10 gm

Manganese 16.69 % Mn 21.56 % MnO

Aluminum 16.40 % Al 30.98 % Al₂O₃

Silicon 17.07 % Si 36.51 % SiO₂

Hydrogen 1.23 % H 10.95 % H₂O

Oxygen 48.62 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺Al₂Si₂O₆(OH)₄

IMA Status:

Valid Species (Pre-IMA) 1817

Locality:

Schlaggenwald, Bohemia. Link to MinDat.org Location Data.

Name Origin:

From the Greek karfos - "straw" and lithos - "stone."

Synonym:

ICSD 34520

PDF 19-273

Carpholite Image

Images:

Carpholite

Comments: Golden yellow compact radiating massive carpholite.
Location: Schlaggenwald, Bohemia, Zapadocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Carpholite Crystallography

Axial Ratios:

a:b:c =0.6885:1:0.2543

Cell Dimensions:

a = 13.86, b = 20.13, c = 5.12, Z = 8; V = 1,428.49 Den(Calc)= 3.06

Crystal System:

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

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

By Intensity(I/I_o): 5.73(1), 5.08(0.7), 2.62(0.5),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Ghose S , Sen Gupta P K , Boggs R C , Schlemper E O , American Mineralogist , 74 (1989) p.1084-1090, Crystal chemistry of a nonstoichiometric carpholite,, Kx(Mn2-x,Lix)Al4Si4O12(OH)4F4: A chain silicate related to pyroxenes, Locality: Sawtooth batholith, Idaho, USA

View Additional jPOWD Structure files for Carpholite
[1] [2]

Physical Properties of Carpholite

Cleavage:

{100} Imperfect, {010} Imperfect, {110} Imperfect

Color:

Straw yellow, Greenish gray, Yellowish brown.

Density:

2.9

Diaphaneity:

Transparent to translucent

Fracture:

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

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

5.5 - Knife Blade

Luster:

Silky

Streak:

white

Optical Properties of Carpholite

Gladstone-Dale:

CI meas= 0.023 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.074 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2035,KPDmeas= 0.2147,KC= 0.2198
Ncalc = 1.64 - 1.67

Optical Data:

Biaxial (-), a=1.61, b=1.628, g=1.63, bire=0.0200

Calculated Properties of Carpholite

Electron Density:

Bulk Density (Electron Density)=2.87 gm/cc
note: Specific Gravity of Carpholite =2.90 gm/cc.

Fermion Index:

Fermion Index = 0.0082060313
Boson Index = 0.9917939687

Photoelectric:

PE_Carpholite= 5.33 barns/electron
U=PE_Carpholite x rElectron Density= 15.32 barns/cc.

Radioactivity:

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

Carpholite Classification

Dana Class:

65.01.05.01 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.01)with chains P=2

(65.01.05)Carpholite group

65.01.05.01 Carpholite MnAl2Si2O6(OH)4 C cca 2/m 2/m 2/m

65.01.05.02 Ferrocarpholite (Fe,Mg)Al2Si2O6(OH)4 C cca 2/m 2/m 2/m

65.01.05.03 Magnesiocarpholite MgAl2Si2O6(OH)4 C cca 2/m 2/m 2/m

65.01.05.04 Balipholite BaMg2LiAl3Si4O12(OH,F)8 C cca 2/m 2/m 2/m

65.01.05.05 Potassiccarpholite! (K,Na,[])(Li,Mn)2Al)4Si4O12(OH)4(F,OH)4 C cca 2/m 2/m 2/m

65.01.05.06 Vanadiocarpholite! MnVAl(Si2O6)(OH)4 C cca 2/m 2/m 2/m

Strunz Class:

09.DB.05 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DB -Inosilicates with 2-periodic single chains, Si2O6; Pyroxene-related minerals

09.DB.05 Carpholite MnAl2Si2O6(OH)4 C cca 2/m 2/m 2/m

09.DB.05 Balipholite BaMg2LiAl3Si4O12(OH,F)8 C cca 2/m 2/m 2/m

09.DB.05 Ferrocarpholite (Fe,Mg)Al2Si2O6(OH)4 C cca 2/m 2/m 2/m

09.DB.05 Magnesiocarpholite MgAl2Si2O6(OH)4 C cca 2/m 2/m 2/m

09.DB.05 Potassiccarpholite! (K,Na,[])(Li,Mn)2Al)4Si4O12(OH)4(F,OH)4 C cca 2/m 2/m 2/m

09.DB.05 Vanadiocarpholite! MnVAl(Si2O6)(OH)4 C cca 2/m 2/m 2/m

Other Carpholite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

See Also:

Links to other databases for Carpholite :
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
15 - WWW-MINCRYST

Search for Carpholite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Carpholite :

A Bijoux Google Search for Carpholite
Adam's Minerals Google Search for Carpholite
Cape Minerals Google Search for Carpholite
Dakota Matrix Minerals Google Search for Carpholite
Excalibur Mineral Corp. Google Search for Carpholite
Exceptional Minerals Google Search for Carpholite
John Betts Fine Minerals Search for Carpholite
McDougall Minerals Google Search for Carpholite
Mineral News Website Link
Rock and Mineral Shows Google Search for Carpholite
Weinrich Minerals, Inc. Google Search for Carpholite

Ask about Carpholite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Carpholite

MnAl2Si2O6(OH)4
Dana No: 65.01.05.01 Strunz No: 09.DB.05
Locality:

Notes: