Hogtuvaite Mineral Data

Hogtuvaite Mineral Data +

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General Hogtuvaite Information

Chemical Formula:

(Ca,Na)2(Fe++,Fe+++,Ti,Mg,Mn)6(Si,Be,Al)6O20

Composition:

Molecular Weight = 837.17 gm

Sodium 1.37 % Na 1.85 % Na₂O

Calcium 7.18 % Ca 10.05 % CaO

Magnesium 1.45 % Mg 2.41 % MgO

Titanium 5.15 % Ti 8.59 % TiO₂

Manganese 0.66 % Mn 0.85 % MnO

Beryllium 1.94 % Be 5.38 % BeO

Aluminum 1.93 % Al 3.65 % Al₂O₃

Iron 30.02 % Fe 25.75 % FeO / 14.31 % Fe₂O₃

Silicon 12.08 % Si 25.84 % SiO₂

Oxygen 38.22 % O

______ ______

100.00 % 98.66 % = TOTAL OXIDE

Empirical Formula:

Ca_1.5Na_0.5Fe²⁺₃Fe³⁺_1.5Ti_0.9Mg_0.5Mn²⁺_0.1Si_3.6Be_1.8Al_0.6O₂₀

IMA Status:

Approved IMA 1994

Locality:

Link to MinDat.org Location Data.

Synonym:

Hoegtuvaite

IMA1990-051

Makarochkinite

Hogtuvaite Image

Images:

Hogtuvaite

Comments: Dark platy crystals of hogtuvaite in matrix.
Location: Hogtuva, Mo i Rana, Nordland, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hogtuvaite Crystallography

Axial Ratios:

a:b:c =0.962:1:0.8257

Cell Dimensions:

a = 10.317, b = 10.724, c = 8.855, Z = 2; alpha = 105.77°, beta = 96.21°, gamma = 124.77° V = 769.95 Den(Calc)= 3.61

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 2.5293(1), 8.048(0.9), 2.0979(0.63),

Crystal Structure:

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Grew E S , Barbier J , Britten J , Yates M G , Polyakov V O , Shcherbakova E P , Halenius U , Shearer C K , American Mineralogist , 90 (2005) p.1402-1412, Makarochkinite, Ca2Fe2+4Fe3+TiSi4BeAlO20, a new beryllosilicate member of the, aenigmatite-sapphirine-surinamite group from the Il men Mountains (southern, Urals), Russia, Sample: N86

Physical Properties of Hogtuvaite

Color:

Black.

Density:

3.85

Diaphaniety:

Subtranslucent to Opaque

Hardness:

5.5 - Knife Blade

Luster:

Subadamantine

Optical Properties of Hogtuvaite

Optical Data:

Biaxial (-), a=1.78, g=1.82, bire=0.0400

Calculated Properties of Hogtuvaite

Electron Density:

r_electron=3.50 gm/cc
note: r_Hogtuvaite=3.61 gm/cc.

Fermion Index

Fermion Index = 0.03976
Boson Index = 0.96024

Photoelectric:

PE_Hogtuvaite= 11.51 barns/electron
U=PE_Hogtuvaite x r_electron= 40.33 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hogtuvaite is Not Radioactive

Hogtuvaite Classification

Dana Class:

69.2.1a.3 (69)Inosilicate Chains with Side Branches or Loops

(69.2)with P>2

(69.2.1a)Aenigmatite and related species (Aenigmatite subgroup)

69.2.1a.1 Aenigmatite Na2Fe5TiSi6O20 P1 1

69.2.1a.2 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri

69.2.1a.3 Hogtuvaite (Ca,Na)2(Fe,Fe,Ti,Mg,Mn)6(Si,Be,Al)6O20 P1 1

69.2.1a.4 Krinovite NaMg2CrSi3O10 P1 1

69.2.1a.5 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1

69.2.1a.6 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1

69.2.1a.7 Welshite Ca2Mg4(Mn,Fe)Sb2O2[Si3Be2O18] P1 1

69.2.1a.8 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1

69.2.1a.9 IMA2002-009a! Ca2Fe4FeTiSi4BeAlO20 P1 1

Strunz Class:

VIII/F.14-35 VIII - Silicates

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

VIII/F.14 - Aenigmatite group

VIII/F.14-10 Krinovite NaMg2CrSi3O10 P1 1

VIII/F.14-20 Aenigmatite Na2Fe5TiSi6O20 P1 1

VIII/F.14-30 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1

VIII/F.14-35 Hogtuvaite (Ca,Na)2(Fe,Fe,Ti,Mg,Mn)6(Si,Be,Al)6O20 P1 1

VIII/F.14-40 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri

VIII/F.14-50 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1

VIII/F.14-60 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1

VIII/F.14-70 Welshite Ca2Mg4(Mn,Fe)Sb2O2[Si3Be2O18] P1 1

Other Hogtuvaite Information

References:

NAME( Athena) PHYS. PROP.(37th List of New Min.,Min. Mag. 1996) OPTIC PROP.(37th List of New Min.,Min. Mag. 19)

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Hogtuvaite

(Ca,Na)2(Fe++,Fe+++,Ti,Mg,Mn)6(Si,Be,Al)6O20
Dana No: 69.2.1a.3 Strunz No: VIII/F.14-35
Locality:

Notes: