Howieite Mineral Data

General Howieite Information

Chemical Formula: Na(Fe++,Mn++)10(Fe,Al)2Si12O31(OH)13 Composition: Molecular Weight = 2,544.93 gm    Sodium      0.90 %  Na    1.22 % Na₂O    Magnesium   0.48 %  Mg    0.79 % MgO    Manganese   6.48 %  Mn    8.36 % MnO    Aluminum    0.64 %  Al    1.20 % Al₂O₃    Iron       17.56 %  Fe   18.07 % FeO /  5.02 % Fe₂O₃    Silicon    26.49 %  Si   56.66 % SiO₂    Hydrogen    0.50 %  H     4.50 % H₂O    Oxygen     46.96 %  O              ______        ______               100.00 %       95.82 % = TOTAL OXIDE Empirical Formula: NaFe²⁺_6.4Mn²⁺₃Mg_0.5Fe³⁺_1.6Al_0.62(Si₁₂)2(O₃₁)(OH)_12.7 Environment: In the Jurassic-aged Franciscan Formation metamorphosed to blue-shist facies (high pressure, 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 Robert Andrew Howie (1923-), British mineralogist and petrologist, King's College, London University, UK. Name Pronunciation: Howieite Synonym: ICSD 6257   PDF 19-571  

Howieite Image

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Howieite Crystallography

Axial Ratios: a:b:c =1.0405:1:0.981 Cell Dimensions: a = 10.17, b = 9.774, c = 9.589, Z = 1; alpha = 91.22°, beta = 70.76°, gamma = 108.09° V = 855.25 Den(Calc)= 4.94 Crystal System: TriclinicSpace Group: P1,P1 X Ray Diffraction: By Intensity(I/I_o): 9.18(1), 7.91(0.8), 3.25(0.65), Crystal Structure:

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Wenk H R , American Mineralogist , 59 (1974) p.86-97, Howieite, a new type of chain silicate

 

Physical Properties of Howieite

Cleavage: {010} Good, {100} Distinct, {210} Poor Color: Dark green, Black. Density: 3.378 Diaphaneity: Transparent to Translucent Habit: Bladed - Aggregates of thin lath-like crystals (e.g. kyanite). Luster: Greasy (Oily) Streak: grayish black  

Optical Properties of Howieite

Gladstone-Dale: CI meas= -0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.296 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1448,KPDmeas= 0.2127,KC= 0.2058
Ncalc = 1.7 - 2.02 Optical Data: Biaxial (-), a=1.701, b=1.72, g=1.734, bire=0.0330, 2V(Calc)=80, 2V(Meas)=65. Pleochroism (x): golden yellow. Pleochroism (y): dark lilac green. Pleochroism (z): green.  

Calculated Properties of Howieite

Electron Density: Bulk Density (Electron Density)=3.33 gm/cc
note: Specific Gravity of Howieite =3.38 gm/cc.
Fermion Index: Fermion Index = 0.01
Boson Index = 0.99 Photoelectric: PE_Howieite = 7.90 barns/electron
U=PE_Howieite x rElectron Density= 26.31 barns/cc.
Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Howieite is Not Radioactive  

Howieite Classification

Dana Class: 69.02.03.01 (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.65 09 - SILICATES (Germanates)   09.D - Inosilicates* Structural terminology according to Liebau (1985)   09.DH -Inosilicates with 4-periodic single chains, Si4O12  

09.DH.65 Howieite Na(Fe,Mn)10(Fe,Al)2Si12O31(OH)13 P1,P1 Tri

 

09.DH.65 Taneyamalite (Na,Ca)(Mn,Mg)12[(Si,Al)6O17]2(O,OH)10 P1 1

 

Other Howieite Information

References: NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2) See Also: Links to other databases for Howieite :
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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Ask about Howieite here :
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