Deerite Mineral Data

Deerite Mineral Data +

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General Deerite Information

Chemical Formula:

(Fe++,Mn)6(Fe+++,Al)3Si6O20(OH)5

Composition:

Molecular Weight = 1,052.69 gm

Manganese 10.44 % Mn 13.48 % MnO

Aluminum 1.92 % Al 3.63 % Al₂O₃

Iron 33.16 % Fe 27.30 % FeO / 17.07 % Fe₂O₃

Silicon 16.01 % Si 34.25 % SiO₂

Hydrogen 0.48 % H 4.28 % H₂O

Oxygen 38.00 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺₄Mn²⁺₂Fe³⁺_2.25Al_0.75Si₆O₂₀(OH)₅

IMA Status:

Approved IMA 1964

Locality:

Laytonville quarry, 5 miles south of Laytonville, Mendocino Co. California. Link to MinDat.org Location Data.

Synonym:

ICSD 10421

PDF 19-421

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Deerite Crystallography

Axial Ratios:

a:b:c =0.5712:1:0.5065

Cell Dimensions:

a = 10.786, b = 18.88, c = 9.564, Z = 4; beta = 107.45° V = 1,857.98 Den(Calc)= 3.76

Crystal System:

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

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

By Intensity(I/I_o): 9.03(1), 3.01(0.7), 2.64(0.55),

Crystal Structure:

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Fleet M E , American Mineralogist , 62 (1977) p.990-998, The crystal structure of deerite, Note: sample is from a riebeckite-deerite-garnet schist, near Panoche, San Benito County, California, USA

Physical Properties of Deerite

Cleavage:

[110] Good

Color:

Black.

Density:

3.837

Diaphaniety:

Transparent to Subopaque

Hardness:

6 - Orthoclase

Streak:

black gray

Optical Properties of Deerite

Optical Data:

Biaxial (?), a=1.84, g=1.87, bire=0.0300

Calculated Properties of Deerite

Electron Density:

r_electron=3.65 gm/cc
note: r_Deerite=3.76 gm/cc.

Fermion Index

Fermion Index = 0.01468
Boson Index = 0.98532

Photoelectric:

PE_Deerite= 13.27 barns/electron
U=PE_Deerite x r_electron= 48.47 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Deerite is Not Radioactive

Deerite Classification

Dana Class:

69.2.3.3 (69)Inosilicate Chains with Side Branches or Loops

(69.2)with P>2

(69.2.3)Howieite group

69.2.3.1 Howieite Na(Fe,Mn)10(Fe,Al)2Si12O31(OH)13 P1,P1 Tri

69.2.3.2 Taneyamalite (Na,Ca)(Mn,Mg)12[(Si,Al)6O17]2(O,OH)10 P1 1

69.2.3.3 Deerite (Fe,Mn)6(Fe,Al)3Si6O20(OH)5 P 2₁/a 2/m

Strunz Class:

VIII/F.16-10 VIII - Silicates

VIII/F - Inosilicates (chain and band) modified double chains

VIII/F.16 - Deerite - Taneyamalite series

VIII/F.16-10 Deerite (Fe,Mn)6(Fe,Al)3Si6O20(OH)5 P 2₁/a 2/m

VIII/F.16-20 Howieite Na(Fe,Mn)10(Fe,Al)2Si12O31(OH)13 P1,P1 Tri

VIII/F.16-30 Taneyamalite (Na,Ca)(Mn,Mg)12[(Si,Al)6O17]2(O,OH)10 P1 1

VIII/F.16-40 Johninnesite Na2Mg4Mn12(AsO4)2(Si12O35)(OH)6 P1 1

Other Deerite Information

References:

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

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

Deerite

(Fe++,Mn)6(Fe+++,Al)3Si6O20(OH)5
Dana No: 69.2.3.3 Strunz No: VIII/F.16-10
Locality:

Notes: