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⇱ Protomylonite: Mineral information, data and localities.

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Protomylonite

A rock classification type
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A mylonite where less than 50% of the rock volume has undergone grain size reduction.

i. A mylonitic rock produced from contact-metamorphosed rock, with granulation and flowage being due to overthrusts following the contact surfaces between intrusion and country rock.

Ref: AGI

ii. A coherent crush breccia whose characteristically lenticular, megascopic particles faintly retain primary structures. It is a lower grade in the development of mylonite and ultramylonite.

Compare with: ultramylonite.


Unique IdentifiersHide

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Mindat ID:
48670
Long-form identifier:
mindat:1:1:48670:1

Classification of ProtomyloniteHide

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Internet Links for ProtomyloniteHide

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References for ProtomyloniteHide

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To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
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