Cronstedtite Mineral Data

Cronstedtite Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images       News Help About



[New Updates] [Gallery 1] [Gallery 2] [Gallery 3] [Rock Shop Gallery]
Serving the mineral collector and educator community since 1970
Over 900,000 mineral specimens in stock
New minerals acquired weekly - Wright's Rock Shop


General Cronstedtite Information

Help on Chemical Formula: Chemical Formula: Fe++2Fe+++(SiFe+++)O5(OH)4
Help on Composition: Composition: Molecular Weight = 399.50 gm
   Iron      55.92 %  Fe   35.97 % FeO / 39.97 % Fe2O3
   Silicon    7.03 %  Si   15.04 % SiO2
   Hydrogen   1.01 %  H     9.02 % H2O
   Oxygen    36.04 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+2Fe3+2SiO5(OH)4
Help on Environment: Environment: A low-temperature hydrothermal product in ore veins.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1821
Help on Locality: Locality: Pribram and Kuttenberg, Bohemia of Czechoslovakia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Axel Fredrik Cronstedt (1722-1765), Swedish mineralogist and chemist.
Help on Name Pronunciation: Name Pronunciation: Cronstedtite + Pronunciation Say CRONSTEDTITE
 

Cronstedtite Image

Click Here for Larger Cronstedtite Image in a New Browser Window Images:
Click Here for Larger Cronstedtite Image

Cronstedtite

Comments: Pyramidal crystals of cronstedtite.
Location: Santa Eulalia, Chihuahua, Mexico. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Cronstedtite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:1.29329
Help on Cell Dimensions: Cell Dimensions: a = 5.486, c = 7.095, Z = 1; V = 184.92 Den(Calc)= 3.59
Help on Crystal System: Crystal System: Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: P 31m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.56(1), 7.1(0.9), 3.548(0.6),
Click Here for Large Cronstedtite Structure Window 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


Hendricks S B , American Mineralogist , 24 (1939) p.529-539, Random structures of layer minerals as illustrated by cronstedtite, (2FeO.Fe2O3.SiO2.2H2O). Possible iron content of kaolin

View Additional jPOWD Structure files for Cronstedtite
[1] [2] [3] [4]
 

Physical Properties of Cronstedtite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Brownish black, Greenish black, Dark brown, Black.
Help on Density: Density: 3.34 - 3.35, Average = 3.34
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Habit: Habit: Amorphous - No crystalline form or imitative shape.
Help on Habit: Habit: Divergent - Crystals radiate from a center without producing stellar forms.
Help on Habit: Habit: Pyramidal - Crystals are shaped like pyramids.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: dark olive green
 

Optical Properties of Cronstedtite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.095 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.157 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2154,KPDmeas= 0.2312,KC= 0.2555
Ncalc = 1.85 - 1.92
Help on Optical Data: Optical Data: Biaxial (-), a=1.72, b=1.8, g=1.8, bire=0.0800, 2V(Calc)=0, 2V(Meas)=0.
 

Calculated Properties of Cronstedtite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.25 gm/cc
note: Specific Gravity of Cronstedtite =3.35 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PECronstedtite = 17.04 barns/electron
U=PECronstedtite x rElectron Density= 55.37 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cronstedtite is Not Radioactive
 

Cronstedtite Classification
Help on Dana Class: Dana Class: 71.01.02c.07 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.01)with 1:1 layers
  (71.01.02c)Serpentine group (Amesite subgroup)
 
71.01.02c.01 Amesite Mg2Al(SiAl)O5(OH)4 C1 1
 
71.01.02c.02 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m
 
71.01.02c.03 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2
 
71.01.02c.04 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m
 
71.01.02c.05 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 63 6
 
71.01.02c.06 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1
 
71.01.02c.07 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 31m 3m
Help on Strunz Class: Strunz Class: 09.ED.15 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.ED -Phyllosilicates with kaolinite layers
 
09.ED.15 Clinochrysotile? Mg3Si2O5(OH)4 Cc, C 2/m Mono
 
09.ED.15 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m
 
09.ED.15 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2
 
09.ED.15 Amesite Mg2Al(SiAl)O5(OH)4 C1 1
 
09.ED.15 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m
 
09.ED.15 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono
 
09.ED.15 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m
 
09.ED.15 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 31m 3m
 
09.ED.15 Chrysotile Mg3Si2O5(OH)4 A2/m 2/m
 
09.ED.15 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2
 
09.ED.15 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono
 
09.ED.15 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 63 6
 
09.ED.15 Maufite? (Mg,Ni)Al4Si3O13•4(H2O)(?) Mono ? Mono
 
09.ED.15 Lizardite Mg3Si2O5(OH)4 P1 1
 
09.ED.15 Orthochrysotile? Mg3Si2O5(OH)4 Unk Ortho
 
09.ED.15 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1
 
09.ED.15 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m
 
09.ED.15 Parachrysotile? Mg3Si2O5(OH)4 Unk Ortho
 

Other Cronstedtite Information
Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Cronstedtite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineral and Gemstone Kingdom
13 - Mineralienatlas (Deutsch)
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

Search for Cronstedtite using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Cronstedtite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

Excalibur Minerals

Exceptional Minerals

Fabre Minerals

Heliodor

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Cronstedtite Mineral Data :

Ask about Cronstedtite 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 Espaņol

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

Cronstedtite

Fe++2Fe+++(SiFe+++)O5(OH)4
Dana No: 71.01.02c.07 Strunz No: 09.ED.15
Locality:

 

Notes: