Deerite Mineral Data

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

Environment:

In meta-ironstones and Cu-Fe sulfide deposits, in blueschist facies metasediments formed at high pressure and low temperature.

IMA Status:

Approved IMA 1964

Locality:

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

Name Origin:

Named for William Alexander Deer (1910- ), mineralogist-petrologist, Cambridge University, Cambridge, England.

Name Pronunciation:

Deerite

Synonym:

ICSD 10421

PDF 19-421

Deerite Image

Images:

Deerite

Comments: Black bladed deerite crystals embedded in quartz and fibrous riebeckite.
Location: Laytonville quarry, Laytonville, Mendocino County, California, USA. Scale: See Image.
© Rruff Database

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 - Prismatic H-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),

Physical Properties of Deerite

Cleavage:

{110} Good

Color:

Black.

Density:

3.837

Diaphaneity:

Transparent to Subopaque

Hardness:

6 - Orthoclase

Streak:

black gray

Optical Properties of Deerite

Gladstone-Dale:

CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2274,KPDmeas= 0.2228,KC= 0.2249
Ncalc = 1.85 - 1.86

Optical Data:

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

Calculated Properties of Deerite

Electron Density:

Bulk Density (Electron Density)=3.73 gm/cc
note: Specific Gravity of Deerite =3.84 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Deerite= 13.27 barns/electron
U=PE_Deerite x rElectron Density= 49.46 barns/cc.

Radioactivity:

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

Deerite Classification

Dana Class:

69.02.03.03 (69)Inosilicate Chains with Side Branches or Loops

(69.02)with P>2

(69.02.03)Howieite group

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

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

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

Strunz Class:

09.DH.60 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DH -Inosilicates with 4-periodic single chains, Si4O12

09.DH.60 Deerite (Fe,Mn)6(Fe,Al)3Si6O20(OH)5 P 2₁/a 2/m

Other Deerite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Deerite :
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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Print or Cut-and-Paste your Deerite Specimen Label here :

Deerite

(Fe++,Mn)6(Fe+++,Al)3Si6O20(OH)5
Dana No: 69.02.03.03 Strunz No: 09.DH.60
Locality:

Notes:

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