SUPPORT US. If is important to you, click here to donate to our Fall 2019 fundraiser!
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography

Grace Feldspar Mine, Newtown, Fairfield Co., Connecticut, USA

This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84): 41° 23' 59'' North , 73° 20' 30'' West
Latitude & Longitude (decimal): 41.39972,-73.34167
Köppen climate type:Cfa : Humid subtropical climate

Cruson (1991) gives the only known reference to this obscure locality:

In April of 1921, a veteran of the mine/quarry business named Captain Charles Cook from New Milford, leased the mineral rights of the FA Young farm in Taunton, on the corner of Castle Hill and Great Hill Roads. Here there were several large veins of pegmatite which ran from the northeast to south west across the farm and Cook appears to have worked these veins intensively for several months....

Within a year of opening this last quarry, Cook had exhausted the sites here to his satisfaction and had apparently moved on. Feldspar quarrying had not died out completely, however. In September 1924, William B Warner of Newbury, NY, had again leased the mineral rights to the Young farm. He opened up a new ledge of pegmatite Cook had overlooked, and struck an unusually fine grade of feldspar. He christened his quarry the Grace Feldspar Mine and at the time there was estimated to be a sufficient quantity of high grade rock to last from five to twelve years. It is uncertain how long this operation was carried on, but Warner was in town for at least another year...

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

3 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Early Ordovician
470 - 485.4 Ma

ID: 2974850
Ratlum Mountain Schist

Age: Early Ordovician (470 - 485.4 Ma)

Stratigraphic Name: Ratlum Mountain Schist

Description: Gray, medium-grained, interlayered schist and granofels, composed of quartz, oligoclase, muscovite (in the schist), biotite, and garnet, also staurolite and kyanite in the schist. Numerous layers and lenses of amphibolite; also some of quartz-spessartine (coticule) and calc-silicate rock.

Comments: Part of Central Lowlands; Iapetus (Oceanic) Terrane - Connecticut Valley Synclinorium; Hartland Belt. Equivalents of Savoy Schist of Massachusetts (Emerson, 1898, 1917) (CT009, CT010) and of Moretown Formation of Vermont and Massachusetts (Bedrock Geologic Map of Massachusetts, Zen and others, 1983) (CT011) (includes Golden Hill and Ratlum Mountain Schists) (Lower? Ordovician).

Lithology: Major:{schist,granofels}, Minor:{amphibolite}, Incidental:{calc silicate rock}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Cruson, Daniel. (1991), Feldspar Quarries and The Mining History of Newtown. Triassic Valley Bulletin: August/September.

Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: December 15, 2019 10:25:43 Page generated: December 21, 2017 16:28:57
Go to top of page