Sturtite Mineral Data

Sturtite Mineral Data

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General Sturtite Information

Chemical Formula:

(Fe3+)(Mn2+,Ca,Mg)Si4O10(OH)3·10(H2O)

Composition:

Molecular Weight = 606.77 gm

Calcium 1.98 % Ca 2.77 % CaO

Magnesium 0.40 % Mg 0.66 % MgO

Manganese 5.43 % Mn 7.01 % MnO

Iron 9.20 % Fe 13.16 % Fe₂O₃

Silicon 18.51 % Si 39.61 % SiO₂

Hydrogen 3.82 % H 34.14 % H₂O

Oxygen 60.65 % O

______ ______

100.00 % 97.36 % = TOTAL OXIDE

Empirical Formula:

Fe³⁺Mn²⁺_0.6Ca_0.3Mg_0.1Si₄O₁₀(OH)₃·10(H₂O)

Environment:

An inadequately characterized mineral.

IMA Status:

Not Approved IMA

Locality:

Broken Hill, New South Wales, Australia. Link to MinDat.org Location Data.

Name Origin:

Named for C. Sturt.

Sturtite Image

Images:

Sturtite

Comments: Dark red-brown resinous massive sturtite.
Location: North Mine, Broken Hill, New South Wales, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Sturtite Crystallography

Crystal System:

Amorphous- No Crystals

Physical Properties of Sturtite

Color:

Black.

Density:

2.05

Hardness:

3-3.5 - Calcite-Copper Penny

Luster:

Vitreous - Greasy

Streak:

yellowish brown

Optical Properties of Sturtite

Optical Data:

NCalc= 1.53 - from Gladstone-Dale relationship (KC = 0.2609) where Ncalc=Dmeas*KC+1

Calculated Properties of Sturtite

Electron Density:

r_electron=2.10 gm/cc
note: r_Sturtite=2.05 gm/cc.

Fermion Index

Fermion Index = 0.01132
Boson Index = 0.98868

Photoelectric:

PE_Sturtite= 5.00 barns/electron
U=PE_Sturtite x r_electron= 10.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sturtite is Not Radioactive

Sturtite Classification

Dana Class:

78.0.0.0 (78)Unclassified Silicate Minerals

(78.0)Without Dana Classification Numbers

(Silicate, Unclassified)

Strunz Class:

VIII/H.26-70 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.26 - Allophane - Sturtite series

VIII/H.26-10 Allophane Al2O3·(SiO2)1.3-2·((H2O))2.5-3 None

VIII/H.26-30 Imogolite Al2SiO3(OH)4 ? Mono

VIII/H.26-40 Odinite (Fe,Mg,Al,Fe,Ti,Mn)2.5(Si,Al)2O5(OH)4 Cm m

VIII/H.26-50 Hisingerite Fe2Si2O5(OH)4·2(H2O) Unk Mono

VIII/H.26-60 Neotocite (Mn,Fe)SiO3·(H2O)(?) None

VIII/H.26-70 Sturtite (Fe3)(Mn2,Ca,Mg)Si4O10(OH)3·10(H2O) None

Other Sturtite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Sturtite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Sturtite

(Fe3+)(Mn2+,Ca,Mg)Si4O10(OH)3·10(H2O)
Dana No: Unknown Strunz No: VIII/H.26-70
Locality:

Notes: