Mineralogy Database

Monticellite Mineral Data

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General Monticellite Information

Help on Chemical  Formula: Chemical Formula: CaMgSiO4
Help on Composition: Composition: Molecular Weight = 156.47 gm
   Calcium    25.61 %  Ca   35.84 % CaO
   Magnesium  15.53 %  Mg   25.76 % MgO
   Silicon    17.95 %  Si   38.40 % SiO2
   Oxygen     40.90 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaMgSiO4
Help on Environment: Environment: Occurs in a carbonatite, a magmatic product of silica-deficient magma differentiation and rich in CO2.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1831
Help on Locality: Locality: Magnet Cove, Hot Spring Co., Arkansas, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Teodoro Monticelli (1759-1846), Italian Mineralogist.
Help on Name Pronunciation: Name Pronunciation: Monticellite + Pronunciation Say MONTICELLITE
Help on Synonym: Synonym: ICSD 79792
  PDF 35-590

Monticellite Image

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Comments: Pale brown crystalline massive monticellite.
Location: Crestmore Quarry, Riverside County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Monticellite   Melilite

Comments: Thin-section image of monticellite interstitial between unaltered melilite crystals (CanMin v. 41. p 1259).
Location: Skarns along the contact of a diorite intrusion at Oravit¸a, Banat, in Romania. Scale: Field of View 2.7 mm.
© Canadian Mineralogist

Monticellite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4345:1:0.5749
Help on Cell Dimensions: Cell Dimensions: a = 4.815, b = 11.08, c = 6.37, Z = 4; V = 339.84 Den(Calc)= 3.06
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.666(1), 2.586(0.4), 3.637(0.4),

Physical Properties of Monticellite

Help on Cleavage: Cleavage: {010} Indistinct
Help on Color: Color: Colorless, Greenish gray, Gray.
Help on Density: Density: 3.2
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5 - Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Monticellite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2154,KPDmeas= 0.2059,KC= 0.2067
Ncalc = 1.63 - 1.66
Help on Optical Data: Optical Data: Biaxial (-), a=1.639-1.663, b=1.645-1.674, g=1.653-1.68, bire=0.0140-0.0170, 2V(Calc)=72-84, 2V(Meas)=88-65. Dispersion relatively weak.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.

Calculated Properties of Monticellite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.19 gm/cc
note: Specific Gravity of Monticellite =3.20 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEMonticellite = 4.17 barns/electron
U=PEMonticellite x rElectron Density= 13.31 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Monticellite is Not Radioactive

Monticellite Classification

Help on  Dana Class: Dana Class: (51)Nesosilicate Insular SiO4 Groups Only
  (51.03)with all cations in octahedral [6] coordination
  (51.03.02)Monticellite - Kirschsteinite series Monticellite CaMgSiO4 P nma 2/m 2/m 2/m Kirschsteinite CaFeSiO4 Pbmn 2/m 2/m 2/m Glaucochroite CaMnSiO4 Pbnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.AC.10 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AC -Nesosilicates without additional anions;
09.AC.10 Monticellite CaMgSiO4 P nma 2/m 2/m 2/m

Other Monticellite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Monticellite :
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 - University of Colorado - Mineral Structure Data

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Dana No: Strunz No: 09.AC.10





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