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Porphyroid

A rock subtype
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05295960017272472916371.jpg
Porphyroid

KitzbÞhel, KitzbÞhel District, Tyrol, Austria
05295960017272472916371.jpg
Porphyroid

KitzbÞhel, KitzbÞhel District, Tyrol, Austria
05295960017272472916371.jpg
Porphyroid

KitzbÞhel, KitzbÞhel District, Tyrol, Austria
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About PorphyroidHide

Ambiguous term originally proposed for igneous rocks allied to porphyry. Later used for metamorphosed acid volcanic rocks or tuffs.

Perhaps most commonly used for metamorphosed blastoporphyritic rocks of uncertain but probable igneous origin with phenocrysts or porphyroblasts, usually of feldspar and quartz, typically in a phyllic groundmass.


Unique IdentifiersHide

Mindat ID:
50724
Long-form identifier:
mindat:1:1:50724:4

Similar NamesHide

PorphyriteA rock subtype

Classification of PorphyroidHide

Common AssociatesHide

Associations Based on Photo Data:
1 photo of Porphyroid associated with SideriteFeCO3

Internet Links for PorphyroidHide

References for PorphyroidHide

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