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Greenstone

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A granofels whose greenish colour is due to the presence of minerals such as actinolite, chlorite and epidote.

Also:
i. A field term applied to any compact dark-green altered or metamorphosed basic igneous rock (e.g., spilite, basalt, gabbro, diabase) that owes its color to the presence of chlorite, actinolite, or epidote.

Compare with: greenschist

ii. See: Nephrite

iii. An informal name for a greenish gemstone, such as fuchsite or chiastolite.

Ref: AGI

iv. Compact, igneous rocks that have developed enough chlorite in alteration to give them a green cast. They are mostly diabases and diorites. Greenstone is partially synonymous with trap. It is often used as a prefix to other rock names. The term is used frequently when no accurate determination is possible.

v. Includes rocks that have been metamorphosed or otherwise so altered that they have assumed a distinctive greenish color owing to the presence of one or more of the following minerals: chlorite, epidote, or actinolite.

vi. Freshly quarried stone containing quarry water.

Ref: Arkell

vii. Can. Generalized name given to Precambrian lavas.

Ref: Hoffman


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Classification of GreenstoneHide

Sub-divisions of GreenstoneHide

Mineralogy of GreenstoneHide

Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
ChloriteA name commonly used for undifferentiated members of the chlorite group.
Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Pronounciation of GreenstoneHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

References for GreenstoneHide

Reference List:
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Fettes (et al.), Metamorphic Rocks - A Classification and Glossary of Terms (2007) Cambridge University Press

Internet Links for GreenstoneHide

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