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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

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