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Amherstite

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A leucocratic variety of quartz monzodiorite of QAPF field 9* belonging to the charnockitic rock series. The rock consists essentially of andesine- microcline antiperthite with minor quartz and hypersthene (= enstatite). It is suggested (Streckeisen, 1974, p.357) that this term should be abandoned.


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Classification of AmherstiteHide

Quartz-monzodiorite is in section 9* of the QAPF diagram.

Mineralogy of AmherstiteHide

Essential minerals - these are minerals that are required within the classification of this rock:
AntiperthiteAn intergrowth of orthoclase (often as lamellae) enclosed in a plagioclase host.
Feldspar > Alkali Feldspar > MicroclineK(AlSi3O8)
Feldspar > Plagioclase > Andesine(Na,Ca)[Al(Si,Al)Si2O8]
Hypersthene(Mg,Fe)SiO3
Silica > QuartzSiO2

Pronounciation of AmherstiteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Other InformationHide

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 AmherstiteHide

Reference List:
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Le Maitre (ed.) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press

Internet Links for AmherstiteHide

 
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