Schorlomite Mineral Data

Schorlomite Mineral Data +

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General Schorlomite Information

Chemical Formula:

Ca3(Ti,Fe+++,Al)2[(Si,Fe+++,Fe++)O4]3

Composition:

Molecular Weight = 516.73 gm

Calcium 23.27 % Ca 32.56 % CaO

Titanium 15.75 % Ti 26.28 % TiO₂

Aluminum 0.52 % Al 0.99 % Al₂O₃

Iron 11.89 % Fe 4.17 % FeO / 12.36 % Fe₂O₃

Silicon 11.41 % Si 24.42 % SiO₂

Oxygen 37.16 % O

______ ______

100.00 % 100.77 % = TOTAL OXIDE

Empirical Formula:

Ca₃Ti_1.7Fe³⁺_0.2Al_0.13(Si_0.7)3(Fe³⁺_0.2)3(Fe²⁺_0.1)3(O₄)

Environment:

Alkaline igneous rocks.

IMA Status:

Valid Species (Pre-IMA) 1846

Locality:

Magnet Cove, Hot Springs County, Arkansas. Link to MinDat.org Location Data.

Name Origin:

Named for the mineral schorl and from the Greek "homos," the same, in allusion to its resemblance to schorl.

Synonym:

ICSD 76867

PDF 33-285

Schorlomite Image

Images:

Schorlomite

Comments: Lustrous massive black schorlomite.
Location: Magnet Cove, Hot Spring County, Arkansas, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Schorlomite Crystallography

Cell Dimensions:

a = 12.128, Z = 8; V = 1,783.89 Den(Calc)= 3.85

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: I a3d

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

By Intensity(I/I_o): 2.712(1), 3.035(0.8), 2.475(0.6),

Forms:

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Forms: [ 2 1 1]

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Crystal Structure:

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Peterson R C , Locock A J , Luth R W , The Canadian Mineralogist , 33 (1995) p.627-631, Positional disorder of oxygen in garnet: the crystal-structure, refinement of schorlomite, Sample: model 1

View Additional jPOWD Structure files for Schorlomite
[1] [2] [3]

Physical Properties of Schorlomite

Cleavage:

None

Color:

Pitch black, Brownish black.

Density:

3.81 - 3.88, Average = 3.84

Diaphaniety:

Translucent to Subopaque

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

7-7.5 - Quartz-Garnet

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Metallic

Streak:

dark brown

Optical Properties of Schorlomite

Gladstone-Dale:

CI meas= 0.052 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.053 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2494,KPDmeas= 0.2497,KC= 0.2634

Optical Data:

Isotropic, n=1.94-1.98.

Calculated Properties of Schorlomite

Electron Density:

r_electron=3.76 gm/cc
note: r_Schorlomite=3.85 gm/cc.

Fermion Index

Fermion Index = 0.02871
Boson Index = 0.97129

Photoelectric:

PE_Schorlomite= 9.47 barns/electron
U=PE_Schorlomite x r_electron= 35.60 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Schorlomite is Not Radioactive

Schorlomite Classification

Dana Class:

51.4.3c.1 (51)Nesosilicate Insular SiO4 Groups Only

(51.4)with cations in [6] and >[6] coordination

(51.4.3c)Garnet group (Schorlomite - Kimzeyite series)

51.4.3c.1 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m

51.4.3c.2 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m

51.4.3c.3 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m

Strunz Class:

VIII/A.08-120 VIII - Silicates

VIII/A - Nesosilicates with [SiO4]4-groups, cations of octahedral and cubic orientation [8+6]

VIII/A.08 - Garnet group, Pyrope - Henritermierite

VIII/A.08-10 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-20 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-30 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-40 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-50 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-60 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-70 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-80 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m

VIII/A.08-90 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m

VIII/A.08-100 Hydrougrandite? (Ca,Mg,Fe)3(Fe,Al)2(SiO4)3-x(OH)4x I a3d 4/m 3 2/m

VIII/A.08-110 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-120 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m

VIII/A.08-125 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m

VIII/A.08-130 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-138 Yamatoite! (Mn,Ca)3(V,Al)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-140 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m

VIII/A.08-150 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m

VIII/A.08-160 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

Other Schorlomite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Schorlomite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineral and Gemstone Kingdom
13 - Mineralienatlas (Deutsch)
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - Scandinavian mineral gallery
17 - WWW-MINCRYST

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

Schorlomite

Ca3(Ti,Fe+++,Al)2[(Si,Fe+++,Fe++)O4]3
Dana No: 51.4.3c.1 Strunz No: VIII/A.08-120
Locality:

Notes: