Chondrodite Mineral Data

General Chondrodite Information

Chemical Formula:

(Mg,Fe++)5(SiO4)2(F,OH)2

Composition:

Molecular Weight = 382.12 gm

Magnesium 23.85 % Mg 39.55 % MgO

Iron 18.27 % Fe 23.50 % FeO

Silicon 14.70 % Si 31.45 % SiO₂

Hydrogen 0.13 % H 1.18 % H₂O

Oxygen 35.59 % O

Fluorine 7.46 % F 7.46 % F

- % F -3.14 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg_3.75Fe²⁺_1.25(SiO₄)₂F_1.5(OH)_0.5

Environment:

Contact metamorphic rocks.

IMA Status:

Valid Species (Pre-IMA) 1817

Locality:

Wunsiedel and Passau, Germany. Link to MinDat.org Location Data.

Name Origin:

From the Greek chondros - "grain."

Name Pronunciation:

Chondrodite + Pronunciation

Synonym:

Fluosiderite - F-rich chondrodite

ICSD 15180

PDF 12-527

Chondrodite Image

Images:

Chondrodite

Comments: Lustrous and semi-transparent crystal of reddish brown chondrodite 1 cm in size with magnetite and muscovite.
Location: Palabora mine, Loolekop, Phalaborwa, Limpopo Province, South Africa. Scale: 4 x 2.6 x 2.4 cm.
© John Betts - Fine Minerals

Images:

Chondrodite Warwickite

Comments: Black crystalline warwickite with tan chondrodite in white marble.
Location: Amity, near Warwick, Orange County, New York, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Chondrodite Crystallography

Axial Ratios:

a:b:c =1.6638:1:2.1712

Cell Dimensions:

a = 7.87, b = 4.73, c = 10.27, Z = 2; beta = 109.033° V = 361.40 Den(Calc)= 3.51

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 2.252(1), 2.272(1), 1.737(0.95),

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

Gibbs G V , Ribbe P H , Anderson C P , American Mineralogist , 55 (1970) p.1182-1194, The crystal structures of the humite minerals. II. Chondrodite

View Additional jPOWD Structure files for Chondrodite
[1] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [2] [3] [4] [5] [6] [7] [8] [9]

Physical Properties of Chondrodite

Cleavage:

{100} Good

Color:

Yellow, Orange, Brownish white, Reddish white, Greenish white.

Density:

3.1 - 3.2, Average = 3.15

Diaphaneity:

Transparent to translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luminescence:

Fluorescent, Short UV=orange yellow, Long UV=orange.

Luster:

Vitreous - Greasy

Streak:

gray

Optical Properties of Chondrodite

Gladstone-Dale:

CI meas= -0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.084 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1798,KPDmeas= 0.2003,KC= 0.1962
Ncalc = 1.61 - 1.69

Optical Data:

Biaxial (+), a=1.592-1.643, b=1.602-1.655, g=1.619-1.675, bire=0.0270-0.0320, 2V(Calc)=76-78, 2V(Meas)=64-90. Dispersion weak to moderate, r > v.

Pleochroism (x):

yellowish brown, deep chrome yellow, reddish brown, or brownish yellow.

Pleochroism (y):

pale yellowish brown, yellow, pale reddish brown, or yellowish green.

Calculated Properties of Chondrodite

Electron Density:

Bulk Density (Electron Density)=3.09 gm/cc
note: Specific Gravity of Chondrodite =3.15 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Chondrodite= 6.55 barns/electron
U=PE_Chondrodite x rElectron Density= 20.25 barns/cc.

Radioactivity:

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

Chondrodite Classification

Dana Class:

52.03.02b.02 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.03)with cations in [6] coordination only

(52.03.02b)Humite group (Chondrodite series)

52.03.02b.01 Alleghanyite Mn5(SiO4)2(OH)2 P 2₁/a 2/m

52.03.02b.02 Chondrodite (Mg,Fe)5(SiO4)2(F,OH)2 P 2₁/c 2/m

52.03.02b.03 Reinhardbraunsite Ca5(SiO4)2(OH,F)2 P 2₁/a 2/m

52.03.02b.04 Ribbeite (Mn,Mg)5(SiO4)2(OH)2 P nma 2/m 2/m 2/m

52.03.02b.05 Kumtyubeite! Ca5(SiO4)2F2 P 2₁/a 2/m

Strunz Class:

09.AF.45 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AF -Nesosilicates with additional anions;

09.AF.45 Alleghanyite Mn5(SiO4)2(OH)2 P 2₁/a 2/m

09.AF.45 Chondrodite (Mg,Fe)5(SiO4)2(F,OH)2 P 2₁/c 2/m

09.AF.45 Reinhardbraunsite Ca5(SiO4)2(OH,F)2 P 2₁/a 2/m

09.AF.45 Kumtyubeite! Ca5(SiO4)2F2 P 2₁/a 2/m

Other Chondrodite Information

Search for Chondrodite using:

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

Visit our Advertisers for Chondrodite :

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

Ask about Chondrodite 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 Chondrodite Specimen Label here :

Chondrodite

(Mg,Fe++)5(SiO4)2(F,OH)2
Dana No: 52.03.02b.02 Strunz No: 09.AF.45
Locality:

Notes: