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Cronstedtite Mineral Data

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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

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  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 Pyramidal H-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),
 

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 - 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

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Cronstedtite

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

 

Notes:

 

 
   
 


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