Schorlomite Mineral Data

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.

Name Pronunciation:

Schorlomite + Pronunciation

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 - Hexoctahedral H-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),

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Physical Properties of Schorlomite

Cleavage:

None

Color:

Pitch black, Brownish black.

Density:

3.81 - 3.88, Average = 3.84

Diaphaneity:

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= 0.08 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.081 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2494,KPDmeas= 0.2497,KC= 0.2713
Ncalc = 2.03 - 2.05

Optical Data:

Isotropic, n=1.94-1.98.

Calculated Properties of Schorlomite

Electron Density:

Bulk Density (Electron Density)=3.76 gm/cc
note: Specific Gravity of Schorlomite =3.85 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Schorlomite= 9.47 barns/electron
U=PE_Schorlomite x rElectron Density= 35.60 barns/cc.

Radioactivity:

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

Schorlomite Classification

Dana Class:

51.04.03c.01 (51)Nesosilicate Insular SiO4 Groups Only

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

(51.04.03c)Garnet group (Schorlomite - Kimzeyite series)

51.04.03c.01 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m

51.04.03c.02 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m

51.04.03c.03 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m

Strunz Class:

09.AD.25 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AD -Nesosilicates without additional anions;

09.AD.25 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m

09.AD.25 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

09.AD.25 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m

09.AD.25 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m

09.AD.25 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m

09.AD.25 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m

09.AD.25 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Wadalite Ca6Al5Si2O16Cl3 I 43d 4 3m

09.AD.25 Holtstamite! Ca3(Al,Mn)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 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineral and Gemstone Kingdom
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - Scandinavian mineral gallery
17 - WWW-MINCRYST

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Schorlomite

Ca3(Ti,Fe+++,Al)2[(Si,Fe+++,Fe++)O4]3
Dana No: 51.04.03c.01 Strunz No: 09.AD.25
Locality:

Notes:

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