Mindat Logo

Dunton Gem Quarry, Newry, Oxford Co., Maine, USA
This page kindly sponsored by Henry Minot

Latitude: 44°32'34"N
Longitude: 70°43'23"W
 
 
Granite pegmatite. This is a LCT class granite pegmatite. The mineral list below also contains species from chlorite/actinolite schist host rocks. Hall's Ridge, Plumbago-Puzzle Mountain - Oxford pegmatite field. Land currently owned by Plumbago Timber and Quarries LLC which permitted use of new mineral discovery information to appear on mindat.

Discovered in 1898 by Henry C. Hall who was the brother-in-law of the landowner, Joshua Abbott. Property obtained by International Paper Company in 1898. Leased to Hollis C. Dunton and partners 1902-1904, perhaps until 1905. leased by General Electric Corporation in 1926-1930, with Wallace Dickerson "Dick" Nevel as superintendent. George Crooker worked for Nevel in 1926-1927. Leased briefly by Harvard University in 1949. Leased briefly in 1966 by Richard "Dick" Robinson of Pennacook, New Hampshire. leased by Plumbago Mining Corporation 1972-1977. Leased by Joseph "Joey" Martin 1985-1989. Leased by American Tourmaline Fields from 1989-1996. Purchased by Plumbago Timber and Quarries LLC in 2004.
The first rose quartz crystals known in the world were found at Mount Mica Quarry about 1913-1915. The second locality for genuine rose quartz crystals in the world, the Dunton Gem Quarry, Newry, produced it's first crystals in 1927. A third world locality was discovered in 1942, at the rose quartz Crystal locality, Newry, by George Crooker. Rose quartz crystals were found at the Nevel Quarry, Newry and in the Red Hill Quarry Group, Rumford, Maine in 1949. Rose quartz crystals were not known in Brazil until 1958.

CAUTION: Because of the high demand and low supply of the very special "Newry" gem tourmaline shades, Namibian tourmaline and Afghani tourmaline sellers, who have gem rough almost matching "Newry" color shades, report that they have brisk sales in Maine and New England. Their explanation is that the stones or rough have a "rare" color that mimics authentic Dunton Quarry tourmaline colors. However, buyer beware! It is more than unlikely to have hundreds or thousands of carats of "rare color" tourmaline in stock! One important feature of genuine gem tourmaline from the Dunton Pegmatite is that almost all of the desirable light shades of pink and green tourmaline have a medium to bright blue-white FLUORESCE in short wave ultraviolet light. This property does not guarantee that the tourmaline in question is genuinely from Newry, but it does limit the mislabeling or "mis-branding" of tourmaline as coming from Newry when it does not.

Beesley (1975) was the first to discover that Dunton Quarry untreated elbaite FLUORESCES "light chalky blue" in short wave ultraviolet light while he reported that heat treating intensifies Dunton Quarry tourmaline's blue-white fluorescence. Heating may occasionally turn the body color of Dunton elbaite colorless, however. Fluorescent tourmaline is uncommon, but not rare and has been observed in localities in Maine, Brazil, Afghanistan, Madagascar, Mozambique and elsewhere. Maine tourmaline appears to have some of the stronger fluorescing tourmaline with the pink body color tourmaline fluorescing brighter than green body color tourmaline. Inclusions are very distinctive in Newry gem tourmaline and inclusions may have three phases. Beesley provided illustrations of the inclusions in Dunton elbaite and suggested that these inclusions could also be used to verify the origin of the Newry tourmaline from mislabeled specimens. The species in Dunton Quarry tourmaline inclusions was not identified, however.

Mineral List

Actinolite
Albite
var: Cleavelandite
var: Zygadite
Almandine
Amblygonite
Anatase
Annite
Arsenopyrite
Autunite
Beraunite
Bermanite
Bertrandite
Beryl
var: Aquamarine
var: Goshenite
var: Morganite
Beryllonite
'Biotite'
Bismuth
Cassiterite
Chalcopyrite
Chrysoberyl
Clarkeite
Clinochlore
Columbite-(Mn)
Cookeite
Crandallite
Cryptomelane
'Cymatolite'
'Dahllite'
Diadochite
Dickinsonite-(KMnNa)
Dravite
Earlshannonite
Elbaite
Eosphorite
Fairfieldite
Ferrostrunzite
Fluorapatite
var: Carbonate-rich Fluorapatite
Foitite
Fourmarierite
Goethite
Goyazite
Greifensteinite
'Gummite'
Hematite
Herderite
Heterosite
Hureaulite
Hydroxylapatite
Hydroxylherderite
Jahnsite-(CaMnFe)
Kaolinite
Kastningite
Laueite
Lepidolite
Löllingite
Magnesio-hornblende
Mangangordonite (TL)
Meta-autunite
Metaswitzerite
Metatorbernite
Metavanmeersscheite
Microcline
Microlite Group
Mitridatite
Montebrasite
Montmorillonite
Moraesite
Muscovite
var: Damourite
Opal
var: Opal-AN
Perhamite (TL)
Petalite
Phosphophyllite
Phosphosiderite
Phosphuranylite
'Pinite'
Pollucite
Pyrite
Quartz
var: Rose Quartz
Reddingite ?
Rhodochrosite
Rockbridgeite
Romanèchite
Roscherite ?
Rutherfordine
Schoepite
Schoonerite
Schorl
Scorzalite
Siderite
Sphalerite
Spodumene
var: Kunzite
Stewartite
Strengite
Strunzite
Switzerite
Tantalite-(Mn)
Todorokite
Torbernite
'Tourmaline
var: Achroite'

'var: Indicolite'
'var: Rubellite'
'var: Verdelite'
'var: Watermelon Tourmaline'
Triphylite
Triploidite
'Unnamed (Ca-analogue of Zigrasite)'
Uralolite
Uraninite
Uranophane
Uranophane-β
Ushkovite
Vandendriesscheite
Vanmeersscheite
Vivianite
Wardite
Whitlockite
Wodginite
Wölsendorfite
Xanthoxenite
Zigrasite (TL)
Zircon


130 entries listed. 103 valid minerals. 3 type localities (valid minerals). 5 erroneous literature entries.

The above list contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

Cameron, Eugene N.; and others (1954) Pegmatite investigations, 1942-45, in New England. USGS Professional Paper 255.
Beesley, C. (1975) Dunton Mine Tourmaline: An Analysis. Gems and Gemology, 15: 19-24.
King, Vandall T., 1975, Newry, Maine: A Pegmatite Phosphate Locality, Mineralogical Record, v. 6, p. 189-204.
Dunn, Pete J. and Gaines, Richard V. (1978): Uralolite from the Dunton Gem Mine, Newry, Maine: A second occurrence. Mineralogical Record 9(2), 99-100.
King, Vandall T. (1980) Distribution of Alkali and Alkaline-Earth Elements in a Newry, Maine Pegmatite, privately published, Rochester, New York, pp. 131.
King, Vandall T. and Foord, Eugene E., (1994) Mineralogy of Maine, Descriptive Mineralogy, v. 1, Maine Geological Survey, Augusta, Maine.
King, Vandall T. (ed.) (2000) Mineralogy of Maine, V. 2., Maine Geological Survey, Augusta, Maine.
Moore, Paul B. (2000) Analyses of Primary Phosphates from Pegmatites in Maine and Other Localities, in V. T. King (editor), Mineralogy of Maine. Mining History, Gems, and Geology, Maine Geological Survey, Augusta, Maine, p. 333-336.

Mineral and/or Locality  
Search Google  
Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
Current server date and time: October 23, 2014 03:54:16 Page generated: October 22, 2014 17:03:42
Mineral and Locality Search
Mineral:
and/or Locality:
Options
Fade toolbar when not in focusFix toolbar to bottom of page
Hide Social Media Links
Slideshow frame delay seconds