minette (RIOCAm;0)

minette

Olive-gray to pale-gray, 1- to 4-m-wide dikes, mostly massive and porphyritic, but locally schistose, composed of biotite phenocrysts in a fine-grained groundmass of microcline, plagioclase, and quartz. Contains accessory apatite and pyrite, and secondary chlorite, sericite, calcite, and opaque minerals.

State	Rhode Island
Name	minette
Geologic age	Cambro-Ordovician? to Carboniferous?
Lithologic constituents	Major Igneous > Hypabyssal > Lamprophyre (Dike or sill)minette - Olive-gray to pale-gray, 1- to 4-m-wide dikes, mostly massive and porphyritic, but locally schistose, composed of biotite phenocrysts in a fine-grained groundmass of microcline, plagioclase, and quartz. Contains accessory apatite and pyrite, and secondary chlorite, sericite, calcite, and opaque minerals.
Comments	Part of Esmond-Dedham Subterrane (East Bay Area). Printed map unit symbol is OCm, digital is OCmn.
References	Hermes, O.D. (comp.), Gromet, L.P. (comp.), Murray, D.P. (comp.), Hamidzada, N.A., Skehan, J.W., and Mosher, S., 1994, Bedrock geologic map of Rhode Island: Rhode Island Map Series No. 1, Kingston, Rhode Island, scale 1:100,000.
NGMDB product	NGMDB product page for 19719
Counties	Newport

minette

Hermes, O.D. (comp.), Gromet, L.P. (comp.), Murray, D.P. (comp.), Hamidzada, N.A., Skehan, J.W., and Mosher, S., 1994, Bedrock geologic map of Rhode Island: Rhode Island Map Series No. 1, Kingston, Rhode Island, scale 1:100,000.