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Monticellite

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Teodoro Monticelli
Formula:
CaMgSiO4
System:
Orthorhombic
Colour:
Colourless, grey or ...
Lustre:
Vitreous
Hardness:
Member of:
Name:
Named by H.J.Brooke (1831) after Teodoro Monticelli (1759-1845). He published several works on Mount Vesuvius, including "Storia dei fenomeni del Vesuvio" (1823) and "Prodromo della mineralogia vesuviana" (1825). The latter together with Niccolò Covelli (see covellite)

Classification of Monticellite

Approved, 'Grandfathered' (first described prior to 1959)
9.AC.10

9 : SILICATES (Germanates)
A : Nesosilicates
C : Nesosilicates without additional anions; cations in octahedral [6] coordination
51.3.2.1

51 : NESOSILICATES Insular SiO4 Groups Only
3 : Insular SiO4 Groups Only with all cations in octahedral [6] coordination
14.6.10

14 : Silicates not Containing Aluminum
6 : Silicates of Ca with alkali or Mg or both
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Type Occurrence of Monticellite

Physical Properties of Monticellite

Vitreous
Colour:
Colourless, grey or greenish
Hardness (Mohs):

Crystallography of Monticellite

Crystal System:
Orthorhombic
Cell Parameters:
a = 4.81Å, b = 11.08Å, c = 6.37Å
Ratio:
a:b:c = 0.434 : 1 : 0.575
Unit Cell Volume:
V 339.49 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Monticellite

Type:
Biaxial (-)
RI values:
nα = 1.639 - 1.663 nβ = 1.645 - 1.674 nγ = 1.653 - 1.680
2V:
Measured: 88° to 65°, Calculated: 72° to 84°
Max Birefringence:
δ = 0.014 - 0.017
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
relatively weak

Chemical Properties of Monticellite

Formula:
CaMgSiO4
All elements listed in formula:
Common Impurities:
Ti,Al,Fe,Mn,Zn,H2O

Relationship of Monticellite to other Species

Series:
Forms a series with Kirschsteinite (see here)
Member of:
Other Members of Group:
Calcio-olivineCa2SiO4
FayaliteFe22+SiO4
ForsteriteMg2SiO4
GlaucochroiteCaMn2+SiO4
KirschsteiniteCaFe2+SiO4
LaihuniteFe2+Fe23+(SiO4)2
Liebenbergite(Ni,Mg)2SiO4
Olivine(Mg,Fe2+)2SiO4
Roepperite (of Brush)(Fe22+,Mn,Zn)SiO4
TephroiteMn22+SiO4
9.AC.AhrensiteFe2SiO4
9.AC.05FayaliteFe22+SiO4
9.AC.05ForsteriteMg2SiO4
9.AC.05GlaucochroiteCaMn2+SiO4
9.AC.05KirschsteiniteCaFe2+SiO4
9.AC.05LaihuniteFe2+Fe23+(SiO4)2
9.AC.05Liebenbergite(Ni,Mg)2SiO4
9.AC.05TephroiteMn22+SiO4
9.AC.15BrunogeieriteFe22+Ge4+O4
9.AC.15Ringwoodite(Mg,Fe2+)2SiO4
9.AC.20ChesnokoviteNa2[SiO2(OH)2] · 8H2O
14.6.1CombeiteNa2Ca2(Si6O18)0.5
14.6.2PectoliteNaCa2Si3O8(OH)
14.6.3Pectolite-M2abcNaCa2[HSi3O9]
14.6.4DenisoviteCa2(K,Na)Si3O8(F,OH)2
14.6.5TokkoiteK2Ca4[Si7O18(OH)](OH,F)
14.6.6MountainiteKNa2Ca2[Si8O19(OH)] · 6H2O
14.6.7RhodesiteKHCa2Si8O19 · 5H2O
14.6.8MiseriteK1.5-x(Ca,Y,REE)5(Si6O15)(Si2O7)(OH,F)2 · yH2O
14.6.9ÅkermaniteCa2Mg(Si2O7)
14.6.11MerwiniteCa3Mg(SiO4)2
14.6.12DiopsideCaMgSi2O6
14.6.13Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2

Other Names for Monticellite

Name in Other Languages:
Simplified Chinese:钙镁橄榄石
Spanish:Monticellita
Traditional Chinese:鈣鎂橄欖石

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Monticellite

Reference List:
H.J. Brooke (1831): On Monticellite, a new Species of Mineral. The Philosophical Magazine, Or Annals of Chemistry, Mathematics, Astronomy, Natural History and General Science, Vol 10, pp 265-266

Schaller, Waldemar Theodore (1935), Monticellite from San Bernardino County, California, and the monticellite series: American Mineralogist: 20: 815-827.

Neuvonen, Kalle J. (1952), Heat of formation of Merwinite and monticellite: American Journal of Science, Bowen volume: 373-380.

Onken H (1964) Verfeinerung der kristallstruktur von monticellit, Naturwissenschaften, 51, 334-335

Journal of the Mineral Society of Japan (1979): 14: 129.

Valley, J.W. and Essene, E.J. (1979) Vesuvianite, akermanite, monticellite and wollastonite equlibria and high X H2O/CO2 at Cascade slide, Mt Marcy Quad, Adirondack Mts. EOS: 60: 423.

Kimata M, Nishida N (1987) The crystal structure of Co-monticellite Ca1.255Co0.745SiO4 and its significance as a solid solution crystal, Neues Jahrbuch für Mineralogie, Monatshefte, 1987, 160-170

Sharp Z D, Hazen R M, Finger L W (1987) High-pressure crystal chemistry of monticellite, CaMgSiO4, American Mineralogist, 72, 748-755

Chopelas A (1991) Single crystal Raman spectra of forsterite, fayalite, and monticellite, American Mineralogist, 76, 1101-1109

Pilati T, Demartin F, Gramaccioli C M (1995) Thermal parameters for minerals of the olivine group: their implication on vibrational spectra, thermodynamic functions and transferable force fields, Acta Crystallographica, B51, 721-733

Mouri T, Enami M (2008) Raman spectroscopic study of olivine-group minerals, Journal of Mineralogical and Petrological Sciences, 103, 100-104 [view file]

Internet Links for Monticellite

Localities for Monticellite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Mineral and/or Locality  
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