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Grossmanite

Formula:
CaTi
3+
 
 AlSiO
 
6
System:MonoclinicColour:Light gray
Name:For Lawrence Grossman, Professor of Cosmochemistry at the University of Chicago, born in 1946


Pyroxene Group. Clinopyroxene Subgroup.

Classification of Grossmanite

IMA status:Approved 2009
Nickel-Strunz 10th (pending) edition ID:9.DA.15

9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
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Type Occurrence of Grossmanite

Type Locality:Allende meteorite (Pueblito de Allende meteorite; Qutrixpileo meteorite [NHM cat.]), Pueblito de Allende, Chihuahua, Mexico
General Appearance of Type Material:1-7 micron particles
Place of Conservation of Type Material:Smithsonian USNM 7562
Geological Setting of type material:Carbonaceous chondrite meteorite
Associated Minerals at type locality:
SpinelPerovskiteMelilite

Physical Properties of Grossmanite

Diaphaneity (Transparency):Transparent
Colour:Light gray
Density (calculated):3.41 g/cm3

Crystallography of Grossmanite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b {B1 1 2/b} {C2/c} {C1 2/c 1}
Cell Parameters:a = 9.884Å, b = 8.988Å, c = 5.446Å
β = 105.86°
Ratio:a:b:c = 1.1 : 1 : 0.606
Unit Cell Volume:V 465.39 ų (Calculated from Unit Cell)
Z:4
X-Ray Powder Diffraction:
d-spacingIntensity
2.996 (100)
2.964 (31)
2.909 (25)
2.581 (42)
2.5605 (28)
2.535 (47)
2.130 (19)

Chemical Properties of Grossmanite

Formula:
CaTi
3+
 
 AlSiO
 
6
Essential elements:Al, Ca, O, Si, Ti
All elements listed in formula:Al, Ca, O, Si, Ti

Relationship of Grossmanite to other Species

Member of Group:
Clinopyroxene Subgroup:
Related Minerals - Nickel-Strunz Grouping):

- +
9.DA.05Donpeacorite
(Mn
2+
 
,Mg)Mg[SiO
 
3
]
 
2
9.DA.05Enstatite
Mg
 
2
[SiO
 
3
]
 
2
9.DA.05Ferrosilite
Fe
 
2
[SiO
 
3
]
 
2
9.DA.10Clinoenstatite
Mg
 
2
[Si
 
2
O
 
6
]
9.DA.10Clinoferrosilite
Fe
2+
 
(Fe
2+
 
,Mg)[Si
 
2
O
 
6
]
9.DA.10Kanoite
Mn
2+
 
(Mg,Mn
2+
 
)[Si
 
2
O
 
6
]
9.DA.10Pigeonite
(Mg,Fe
2+
 
,Ca)(Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
9.DA.15Augite
(Ca,Na)(Mg,Fe
2+
 
,Al,Fe
3+
 
,Ti)[(Si,Al)
 
2
O
 
6
]
9.DA.15Diopside
CaMg[Si
 
2
O
 
6
]
9.DA.15Esseneite
CaFe
3+
 
[AlSiO
 
6
]
9.DA.15Hedenbergite
CaFe
2+
 
[Si
 
2
O
 
6
]
9.DA.15Johannsenite
CaMn
2+
 
[Si
 
2
O
 
6
]
9.DA.15Petedunnite
Ca(Zn,Mn
2+
 
,Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
9.DA.15Davisite
CaScAlSiO
 
6
9.DA.15Kushiroite
CaAl[AlSiO
 
6
]
9.DA.20Aegirine-augite
(Na,Ca)(Fe
3+
 
,Fe
2+
 
,Mg,Al)Si
 
2
O
 
6
9.DA.20Omphacite
(Ca,Na)(Mg,Al)[Si
 
2
O
 
6
]
9.DA.25Aegirine
NaFe
3+
 
[Si
 
2
O
 
6
]
9.DA.25Jadeite
Na(Al,Fe
3+
 
)[Si
 
2
O
 
6
]
9.DA.25Jervisite
(Na,Ca,Fe
2+
 
)(Sc,Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
9.DA.25Kosmochlor
NaCr[Si
 
2
O
 
6
]
9.DA.25Namansilite
NaMn
3+
 
[Si
 
2
O
 
6
]
9.DA.25Natalyite
Na(V
3+
 
,Cr)[Si
 
2
O
 
6
]
9.DA.30Spodumene
LiAl[Si
 
2
O
 
6
]

Other Names for Grossmanite

Synonyms:
IMA2008-042a
Other Languages:

Other Information

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

References for Grossmanite

Reference List:Chi Ma and George R. Rossman (2009): Grossmanite, CaTi3+AlSiO6, a new pyroxene from the Allende meteorite. American Mineralogist, 94, 1491–1494.

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    Localities for Grossmanite

    Hide Locality List
    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Mexico
     
    • Chihuahua
      • Pueblito de Allende
    		American Mineralogist, Volume 94, pages 1483–1486, 2009
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 5th Nov 2009 00:19:35