File:"Milford Pink Granite" (Milford Granite, Neoproterozoic, ~606 Ma; Milford area, Massachusetts, USA) 2 (48627611711).jpg
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| Description |
"Milford Pink Granite" - granite from the Precambrian of Massachusetts, USA. "Granite" in the decorative stone trade is any relatively hard rock that will take a fine polish, regardless of mineralogy or chemistry or geologic origin. "Granites" turn out to be felsic to mafic intrusive igneous rocks (granite, granodiorite, porphyritic granite, rapakivi granite, orbicular granite, pegmatitic granite, graphic granite, anorthosite, monzonite, gabbro, norite, gabbronorite, dolerite, diabase, charnockite, etc.) and high-grade to very high-grade metamorphic rocks (metanorthosite, gneiss, metaconglomerate, amphibolite, quartzite, granulite, migmatite). True granites (= monzogranites & syenogranites & porphyritic varieties) make up most of the commercial granite trade. Countless varieties are quarried around the world. The granite seen here is from the Milford Granite of Massachusetts. It's a late Precambrian-aged granite pluton in the Avalon Terrane. The mafic content shows slight foliation. Description of Milford Granite from Kopera & Shaw (2007): Milford Granite Age: ~606 Ma (206Pb/238U) Bright-pink to gray, massive to weakly foliated, medium-grained quartz-plagioclase-microcline-biotite±epidote granite. Biotite content is commonly 3-5%, though locally is as much as 10% or more, and occurs in distinctive fine-grained clots up to 1 centimeter in diameter. Secondary muscovite is common. Commonly known as "Milford Pink". Geologic unit & age: Milford Granite, late Neoproterozoic, ~606 Ma Locality: commercial quarry at or near the town of Milford, eastern Massachusetts, USA; used at Perry's Monument, South Bass Island, Lake Erie, Ohio, USA Reference cited: Kopera & Shaw (2007) - Preliminary bedrock geologic map of the Milford Quadrangle, sheet 1: bedrock geology. Office of the Massachusetts State Geologist Open File Report 07-01. |
| Date | |
| Source | "Milford Pink Granite" (Milford Granite, Neoproterozoic, ~606 Ma; Milford area, Massachusetts, USA) 2 |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/48627611711 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 02:18, 6 December 2019 | | 2,945 × 2,000 (6.38 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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