File:Tremolitic talc schist (Mesoproterozoic, ~1.1 Ga; St. Lawrence County, New York State, USA) 1.jpg

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English: Tremolitic talc schist from the Precambrian of New York State, USA.

Talc schist is a metamorphic rock dominated by the mineral talc (Mg3Si4O10(OH)2 - magnesium hydroxysilicate). Its color usually ranges from mottled, creamy white to mottled gray to light green. It has a pearly luster and a slick, soapy feel. Talc schist, like soapstone and steatite and the mineral talc itself, is very soft (H = 1). Unlike soapstone and steatite, which are crystalline-textured, talcose metamorphic rocks, talc schist has a foliated texture (visible when viewed on edge). Some talc schists formed by hydrothermal metamorphism of dolomitic marbles. Other talc schists are produced by hydrothermal metamorphism of serpentinized peridotites.

This talc schist has a fair amount of a whitish-colored type of amphibole called tremolite (Ca2Mg5Si8O22(OH)2 - calcium magnesium hydroxysilicate).

The sample comes from the northwestern Adirondack Mountains of New York State. Metamorphic dates for talcose and tremolitic rocks in this area are about 1.1 billion years. They were metamorphosed from their precursors during the Grenville Orogeny, an ancient collisional mountain-building event. The Grenville Mountains extended from Quebec to Texas, at least. The Grenville Orogeny was a Rodinia Supercontinent-forming event.

Locality: undisclosed / unrecorded site in St. Lawrence County (probably a mine / quarry), northwestern Adirondack Mountains, northern New York State, USA
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Source https://www.flickr.com/photos/47445767@N05/53309502653/
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@N05/53309502653. It was reviewed on 7 November 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 November 2023

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current17:04, 7 November 2023Thumbnail for version as of 17:04, 7 November 20232,549 × 2,658 (4.69 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53309502653/ with UploadWizard

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