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Amesite

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Big Photo

Saranovskii Mine (Saranovskoe), Saranovskaya (Sarany) Village, Gornozavodskii area, Permskaya Oblast', Middle Urals, Urals Region, Russia
© Chinellato Matteo

Show Amesite Photos (57)



Formula:
Mg
 
2
Al(AlSiO
 
5
)(OH)
 
4
System:TriclinicColour:White, colourless, pink ...
Hardness:2½ - 3
Member of:Serpentine Group
Name:For James Ames, mine owner


Kaolinite-Serpentine group.

Several polytypes are known: 2H1, 2H2, 6R and others.

Classification of Amesite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/H.27-100
Nickel-Strunz 10th (pending) edition ID:9.ED.15

9 : SILICATES (Germanates)
E : Phyllosilicates
D : Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets
Dana 8th edition ID:71.1.2c.1

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
1 : Sheets of 6-membered rings with 1:1 layers
Hey's CIM Ref.:16.19.7

16 : Silicates Containing Aluminum and other Metals
19 : Aluminosilicates of Fe and Mg
mindat.org URL:http://www.mindat.org/min-197.html
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Type Occurrence of Amesite

Type Locality:Chester Emery Mines, Chester, Hampden Co., Massachusetts, USA

Occurrences of Amesite

Geological Setting:Low grade metamorphism of Al-, Mg-rich rocks

Physical Properties of Amesite

Lustre:Pearly
Diaphaneity (Transparency):Transparent
Comment:Somewhat metallic on cleavage
Colour:White, colourless, pink to lilac, pale green
Streak:White with pale green tint
Hardness (Mohs):2½ - 3
Tenacity:Brittle
Cleavage:Perfect
on {001}
Density (measured):2.78 g/cm3
Density (calculated):2.7 g/cm3

Crystallography of Amesite

Crystal System:Triclinic
Class (H-M):1 - Pedial
Cell Parameters:a = 5.307(1) Å, b = 9.195(2) Å, c = 14.068(3) Å
α = 90.09(2)°, β = 90.25(2)°, γ = 89.96(2)°
Ratio:a:b:c = 0.577 : 1 : 1.53
Unit Cell Volume:V 686.48 ų (Calculated from Unit Cell)
Z:4
Morphology:Tapering pseudohexagonal prisms, tabular
Twinning:Common as six fold sector twins on {001}
X-Ray Powder Diffraction:
d-spacingIntensity
7.0 (100)
3.51 (100)
2.600 (40)
2.476 (80)
1.925 (70)
1.528 (60)
1.462 (35)
Comments:Powder data for 2H2 polytype.

Optical Data of Amesite

Type:Biaxial (+)
RI values: nα = 1.597 nβ = 1.599 nγ = 1.615
2V:Measured: 18°
Maximum Birefringence:δ = 0.018

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r < v weak

Chemical Properties of Amesite

Formula:
Mg
 
2
Al(AlSiO
 
5
)(OH)
 
4
Essential elements:Al, H, Mg, O, Si
All elements listed in formula:Al, H, Mg, O, Si

Relationship of Amesite to other Species

Member of:Serpentine Group
Other Members of Group:

- +
Antigorite
Mg
 
3
(Si
 
2
O
 
5
)(OH)
 
4
Baumite
(Mg,Al,Mn,Zn,Fe)
 
3
(Si,Al)
 
2
O
 
5
(OH)
 
4
Berthierine
(Fe
2+
 
,Fe
3+
 
,AlMg)
 
2-3
((Si,Al)
 
2
O
 
5
)(OH)
 
4
Brindleyite
(Ni,Mg,Fe)
 
2
(Al(Si,Al)O
 
5
)(OH)
 
4
Caryopilite
(Mn,Mg)
 
3
(Si
 
2
O
 
5
)(OH)
 
4
Chrysotile
Mg
 
3
(Si
 
2
O
 
5
)(OH)
 
4
Clinochrysotile
Cronstedtite
Fe
2+
2
Fe
3+
 
((Si,Fe
3+
 
)
 
2
O
 
5
)(OH)
 
4
Dickite
Al
 
2
(Si
 
2
O
 
5
)(OH)
 
4
Fraipontite
(Zn,Al)
 
3
((Si,Al)
 
2
O
 
5
)(OH)
 
4
Greenalite
Fe
 
2-3
(Si
 
2
O
 
5
)(OH)
 
4
Halloysite
Al
 
2
(Si
 
2
O
 
5
)(OH)
 
4
Kaolinite
Al
 
2
(Si
 
2
O
 
5
)(OH)
 
4
Kellyite
Mn
2+
2
Al(AlSiO
 
5
)(OH)
 
4
Lizardite
Mg
 
3
(Si
 
2
O
 
5
)(OH)
 
4
Manandonite
LiAl
 
4
(BSi
 
3
O
 
10
)(OH)
 
6
Nacrite
Al
 
2
(Si
 
2
O
 
5
)(OH)
 
4
Népouite
(Ni,Mg)
 
3
(Si
 
2
O
 
5
)(OH)
 
4
Odinite
(Fe,Mg,Al,Fe,Ti,Mn)
 
2.4
((Si,Al)
 
2
O
 
5
)(OH)
 
4
Orthochrysotile
Parachrysotile
Pecoraite
Ni
 
3
(Si
 
2
O
 
5
)(OH)
 
4
Vorhauserite
Related Minerals - Nickel-Strunz Grouping):

- +
9.ED.05Dickite
Al
 
2
(Si
 
2
O
 
5
)(OH)
 
4
9.ED.05Kaolinite
Al
 
2
(Si
 
2
O
 
5
)(OH)
 
4
9.ED.05Nacrite
Al
 
2
(Si
 
2
O
 
5
)(OH)
 
4
9.ED.05Odinite
(Fe,Mg,Al,Fe,Ti,Mn)
 
2.4
((Si,Al)
 
2
O
 
5
)(OH)
 
4
9.ED.10Halloysite
Al
 
2
(Si
 
2
O
 
5
)(OH)
 
4
9.ED.10Hisingerite
Fe
3+
2
(Si
 
2
O
 
5
)(OH)
 
4
 · 2H
 
2
O
9.ED.10Halloysite-7Å
Al
 
2
(Si
 
2
O
 
5
)(OH)
 
4
9.ED.15Antigorite
Mg
 
3
(Si
 
2
O
 
5
)(OH)
 
4
9.ED.15Berthierine
(Fe
2+
 
,Fe
3+
 
,AlMg)
 
2-3
((Si,Al)
 
2
O
 
5
)(OH)
 
4
9.ED.15Brindleyite
(Ni,Mg,Fe)
 
2
(Al(Si,Al)O
 
5
)(OH)
 
4
9.ED.15Caryopilite
(Mn,Mg)
 
3
(Si
 
2
O
 
5
)(OH)
 
4
9.ED.15Chrysotile
Mg
 
3
(Si
 
2
O
 
5
)(OH)
 
4
9.ED.15Cronstedtite
Fe
2+
2
Fe
3+
 
((Si,Fe
3+
 
)
 
2
O
 
5
)(OH)
 
4
9.ED.15Fraipontite
(Zn,Al)
 
3
((Si,Al)
 
2
O
 
5
)(OH)
 
4
9.ED.15Greenalite
Fe
 
2-3
(Si
 
2
O
 
5
)(OH)
 
4
9.ED.15Kellyite
Mn
2+
2
Al(AlSiO
 
5
)(OH)
 
4
9.ED.15Lizardite
Mg
 
3
(Si
 
2
O
 
5
)(OH)
 
4
9.ED.15Manandonite
LiAl
 
4
(BSi
 
3
O
 
10
)(OH)
 
6
9.ED.15Népouite
(Ni,Mg)
 
3
(Si
 
2
O
 
5
)(OH)
 
4
9.ED.15Pecoraite
Ni
 
3
(Si
 
2
O
 
5
)(OH)
 
4
9.ED.15Guidottiite
Mn
 
2
Fe
3+
 
(Fe
3+
 
SiO
 
5
)(OH)
 
4
9.ED.20Allophane
(Al
 
2
O
 
3
)(SiO
 
2
)
 
1.3-2
 · 2.5-3H
 
2
O
9.ED.20Chrysocolla
Cu
 
2-x
Al
 
x
(H
 
2-x
Si
 
2
O
 
5
)(OH)
 
4
 · nH
 
2
O (x < 1)
9.ED.20Imogolite
Al
 
2
SiO
 
3
(OH)
 
4
9.ED.20Neotocite
(Mn,Fe,Mg)SiO
 
3
 · H
 
2
O
9.ED.25Bismutoferrite
Fe
3+
2
Bi(SiO
 
4
)
 
2
(OH)
9.ED.25Chapmanite
Fe
3+
2
Sb
3+
 
(SiO
 
4
)
 
2
(OH)
Related Minerals - Hey's Index Grouping:

- +
16.19.1Indialite
Mg
 
2
Al
 
3
(AlSi
 
5
O
 
18
)
16.19.2Cordierite
(Mg,Fe)
 
2
Al
 
3
(AlSi
 
5
O
 
18
)
16.19.3Sekaninaite
(Fe,Mg)
 
2
Al
 
3
(AlSi
 
5
O
 
18
)
16.19.4Ferro-gedrite
☐{Fe
2+
2
}{Fe
2+
3
Al
 
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
16.19.5Staurolite
(Fe
2+
 
,Mg,Zn)
 
1.5-2
Al
 
9
(SiO
 
4
)
 
4
O
 
6
(OH,O)
 
2
16.19.6Chloritoid
(Fe
2+
 
,Mg,Mn
2+
 
)Al
 
2
(SiO
 
4
)O(OH)
 
2
16.19.8Corundophilite
(Mg,Fe,Al)
 
6
(Si,Al)
 
4
O
 
10
(OH)
 
8
16.19.9Yoderite
Mg(Al,Fe
3+
 
)
 
3
(SiO
 
4
)
 
2
O(OH)
16.19.10Delessite
(Mg,Fe,Fe,Al)(Si,Al)
 
4
O
 
10
(O,OH)
 
8
16.19.11Ferrocarpholite
(Fe
2+
 
,Mg)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
16.19.12Magnesiocarpholite
(Mg,Fe
2+
 
)Al
 
2
(Si
 
2
O
 
6
)(OH)
 
4
16.19.13Chamosite
(Fe
2+
 
,Mg)
 
5
Al(AlSi
 
3
O
 
10
)(OH)
 
8
16.19.14Orthochamosite
(Fe
2+
 
,Mg,Fe
3+
 
)
 
5
Al(AlSi
 
3
O
 
10
)(OH,O)
 
8
16.19.15Berthierine
(Fe
2+
 
,Fe
3+
 
,AlMg)
 
2-3
((Si,Al)
 
2
O
 
5
)(OH)
 
4
16.19.16Odinite
(Fe,Mg,Al,Fe,Ti,Mn)
 
2.4
((Si,Al)
 
2
O
 
5
)(OH)
 
4
16.19.17Clinochlore
(Mg,Fe
2+
 
)
 
5
Al(AlSi
 
3
O
 
10
)(OH)
 
8
16.19.18Gedrite
☐{Mg
 
2
}{Mg
 
3
Al
 
2
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
16.19.19Magnesiogedrite
16.19.20Diabantite
(Mg,Fe,Al)
 
6
((Si,Al)
 
4
O
 
10
)(OH)
 
8
16.19.21Sudoite
(Mg,Fe
2+
 
)
 
2
Al
 
3
(AlSi
 
3
O
 
10
)(OH)
 
8
16.19.22Vermiculite
(Mg,Fe,Al)
 
3
((Al,Si)
 
4
O
 
10
)(OH)
 
2
 · 4H
 
2
O
16.19.23Corrensite
(Mg,Fe)
 
9
((Si,Al)
 
8
O
 
20
)(OH)
 
10
 · nH
 
2
O

Other Names for Amesite

Synonyms:
AmeniteAmensiteAmesineSepteamesite
Other Languages:
German:Amensit
Amesit
Septeamesit
Russian:Амезит
Simplified Chinese:镁绿泥石
Spanish:Amensita
Amesita
Septeamesita
Varieties:
Ferroamesite

Other Information

Health Warning:Amesite is not known to be dangerous, however do not confuse this with Amosite, or Brown Asbestos, which is dangerous. Please view the Amosite page for further information.

References for Amesite

Reference List:

- +
American Mineralogist: 66: 185-195.

Internet Links for Amesite

Search Engines:
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    • External Links:
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  • Look for Amesite on Wikipedia
  • Look for Amesite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Amesite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
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    • Localities for Amesite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Antarctica
     
    • Eastern Antarctica
      • Coats Land
        • Pensacola Mts
    		Am Min 61:5-6 pp 497-499
    Bolivia
     
    • Cochabamba Department
      • Ayopaya Province
    		Alfredo Petrov collection; Laszlo Horvath collection
    Canada
     
    • Manitoba
    • Québec
      • Abitibi-Témiscamingue
        • Témiscamingue RCM
          • Rémigny
    		Reiner Mielke
      • Chaudière-Appalaches
        • Les Appalaches RCM
          • Saint-Joseph-de-Coleraine
          • Thetford Mines
            • Black Lake
    		Taner, M. F. and Laurent, R., 1984, Iron-rich Amesite from the Lake Asbestos Mine, Black Lake, Quebec, Canadian Mineralogist, v. 22, p. 437-442
      • Estrie
        • Memphrémagog RCM
          • Hatley
    		Stevenson, John S (1934) Mineralization at the Eustis Mine, Eustis, Quebec. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology
    China
     
    • Guangdong Province
      • Shaoguan Prefecture
        • Shixing Co.
          • Baishun Uranium ore field
    		[var: Ferroamesite] Zhanshi Zhang, Renmin Hua, Junfeng Ji, Yanchun Zhang, Guolin Guo, and Zhengping Yin (2007): Acta Mineralogica Sinica 27(2), 161-172
    [var: Ferroamesite] Zhanshi Zhang, Renmin Hua, Junfeng Ji, Yanchun Zhang, Guolin Guo, and Zhengping Yin (2007): Acta Mineralogica Sinica 27(2), 161-172
    • Guangxi Zhuang Autonomous Region
      • Baise Prefecture
        • Jingxi Co.
    		Wang, Q.F., Deng, J., Liu, X.F., Zhang, Q.Z., Sun, S.L., Jiang, C.Z., Zhou, F. (2010): Discovery of the REE minerals and its geological significance in the Quyang bauxite deposit, West Guangxi, China. Journal of Asian Earth Sciences 39, 701-712.
    • Hubei Province
      • Shiyan Prefecture
        • Zhushan Co.
    		Shihe Lei, Guiying Tang, Zhengyong Qin, Zicai Zhang, and Bo Liu (1998): Geology and Prospecting 34(4), 13-19
    • Liaoning Province (Manchuria; Dongbei Region)
      • Huludao Prefecture
        • Jianchang Co.
          • Bajiazi Zn-Pb-Ag deposit
    		Yiming Zhao, Yongguan Dong, Daxin Li, and Chengsi Bi (2003): Ore Geology Reviews 23, 153-182.
        • Lianshan District
          • Yangjiazhangzi ore field
    		Wenwei Lin (1987): Mineral Deposits 6(1), 22-34
    Finland
     
    • Southwestern Finland Region
      • Kemiö Island (Kimito Island)
    		Aarne Laitakari, ”Index of Finnish Minerals with bibliography” , Bull. de la Commission Géologique de Finlande No 230, Otaniemi 1967
    France
     
    • Auvergne
      • Puy-de-Dôme
        • Issoire
          • Saint-Babel
    		Barrier, D., Devolle, J.-C., Médard, P, Naud, E. Naud & Pourtier, G. (2009): Si l'amesite m'était Comté... ou pas d'haüyne à Prudeux, Le Cahier des Micromonteurs, 103, 3-8.
    • Languedoc-Roussillon
      • Pyrénées-Orientales
        • Céret
          • Prats de Mollo-La Preste (Prats de Molló-La Presta)
    		Dubru. M, (1986) Pétrologie et géochimie du marbre à brucite et des borates associés au gisement de tungstène de Costabonne, (Pyrénées orientales, France) 930p
    Germany
     
    • Saxony-Anhalt
      • Stassfurt Potash deposit
        • Egeln
          • Tarthun
    		No reference listed
    Greece
     
    • Attikí (Attica; Attika) Prefecture
      • Lavrion (Laurion; Laurium) District
    		Schnorrer-Köhler, G., Rewitzer, C., Standfuss, L. & Standfuss, K. (1988): Weitere Neufunde aus Lavrions antiken Schlacken. Lapis 13 (2), 11-14.
    Hungary
     
    • Veszprém Co.
      • Balaton Uplands
        • Tapolcai Basin
          • Uzsa (Uzsabánya)
    		Szakáll & Gatter: Hun. Min. Spec., 1993
          • Zalahaláp
    		Szakáll & Gatter: Hun. Min.Spec., 1993
    Indonesia
     
    • Irian Jaya (New Guinea)
      • Papua Province
        • New Guinea
          • Carstensz Mts
            • Gunung Bijih District (Grasberg District)
              • Ertsberg Complex
    		Amer.Min.(1995) 80, 65-77
    Italy
     
    • Liguria
      • La Spezia Province
        • Carrodano
    • Piedmont
      • Torino Province
        • Canavese District
          • Léssolo
            • Cálea
    		Le miniere di Brosso (2001)-Italo Campostrini- ed. Museo Regionale Torino
    • Sardinia
      • Nuoro Province
        • Orani
    		Conti-Vecchi, G., Stara, P. (1991): Minerali della Sardegna. Edizioni Della Torre, 275 pp.
    Japan
     
    • Honshu Island
      • Chubu Region
        • Niigata Prefecture
          • Itoigawa City
    		Miyajima et al (1999) Ganko Gakkai Koen Yoshi, 194.
    • Kyushu Region
      • Kagoshima Prefecture
        • Hishikari gold deposit (Hishikari gold mine)
    		Ibaraki, K., and Suzuki, R. (1991): Heilongjiang Geological Information 1991(3), 47-56
    Kazakhstan
     
    • Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
      • Betpakdala Desert (Bet-Pak-Dal Desert)
        • Kara-Oba W deposit
    		Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
    Madagascar
     
    • Antananarivo Province
      • Vakinankaratra Region
        • Sahatany Pegmatite Field (Mt Ibity area)
          • Sahatany Valley
    		Lefevre & Thomas (1998): Les pegmatites de la vallée de la Sahatany, Madagascar. La Règne Minéral, nr 19, 15-28
    Norway
     
    • Telemark
      • Porsgrunn
        • Bjørkedalen
    		Andersen, F., Berge, S.A. & Burvald, I. (1996): Die Mineralien des Langesundsfjords und des umgebenden Larvikit-Gebietes, Oslo-Region, Norwegen. Mineralien-Welt 7(4), 21-100
        • Langangen
          • Slevolden
    		Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 p
        • Mørje
          • Sagåsen
    		Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 p
    Knut Edvard Larsen collection (MM-3862)
    • Vestfold
      • Larvik
        • Sky
    		Atle Michalsen Collection
        • Tvedalen
    		Tom Engvoldsen collection
    Knut Edvard Larsen collection (MM-4014)
    Poland
     
    • Lower Silesia (Dolnośląskie)
      • Gogołów-Jordanów Massif
    		Archiwum Mineralogiczne v. 46, no. 1-2, p. 101-108, 1990
    Russia
     
    • Eastern-Siberian Region
      • Saha Republic (Sakha Republic; Yakutia)
    		[World of Stones 12:49]
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
    		Pekov, I.V. & Podlesnyi, A.S. (2004): Kukisvumchorr Deposit: Mineralogy of Alkaline Pegmatites and Hydrotermalites. Mineralogical Almanac, vol. 7, 140 pages + xxiv photo's pages
    www.koeln.netsurf.de/~w.steffens/lovo.htm
    • Urals Region
      • Middle Urals
        • Permskaya Oblast'
          • Gornozavodskii area
            • Saranovskaya (Sarany) Village
    		No reference listed
    • Western-Siberian Region
      • Polar Urals
        • Nenetskiy Autonomous Okrug
          • Yugorskii Peninsula
            • Pai-Khoi (Paikhoi; Pay Khoy) Range
              • Middle Silova-Yakha River
    		Koval'chuk, N.S., and Makeev, A.B. (2008): Geology of Ore Deposits 50(7), 503-517.
    South Africa
     
    • Northern Cape Province
      • Postmasburg
    		Minerals of South Africa
    Cairncross, B. and Dixon, R., (1995), Minerals of South Africa. The Geological Society of South Africa: 182.
    Minerals of South Africa
    Sweden
     
    • Västmanland
      • Hällefors
    		No reference listed
    USA
     
    • Arizona
      • Pinal Co.
        • Mammoth District
          • Tiger
            • St. Anthony deposit
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 108.
    • California
      • Inyo Co.
        • Talc City District
          • Darwin
    		Norman, L.A. & Richard M. Stewart (1951), Mines and mineral resources of Inyo County, California: California Journal of Mines and Geology: 47(1): 117-118; Page, Benjamin Markham (1951), Talc deposits of steatite grade, Inyo County, California: California Division Mines, Special Report 8, 35 pp.; Hall, Wayne Everett & Edward M. Mackevett (1963), Geology and ore deposits of the Darwin quadrangle, Inyo County, California: USGS PP 368: 81; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 418.
      • Santa Clara Co.
        • Diablo Range
          • Mount Hamilton
      • Santa Cruz Co.
        • Santa Cruz
    		Mineralogical Record: 17:315
    • Colorado
      • Fremont Co.
        • Cotopaxi District
    		"Minerals of Colorado, updated & revised", p. 14, by Eckel, Edwin B., 1997
    • Massachusetts
      • Hampden Co.
        • Blandford
    		"Western Massachusetts Mineral Localities" by Plante, A.R., Valley Geology Press, 1992
        • Chester
    		Min Rec (1978) 9:235-242
    Alan R. Plante, Personal field notes, 1981-1985
    Alan R. Plante, Personal field notes, 1965-1987
    Alan R. Plante, Personal field and lab notes, 1984-1987
    Min Rec (1978) 9:235-242
    Alan R. Plante, Personal field and lab notes, 1982-1985
    • New Hampshire
      • Cheshire Co.
        • Keene
    		No reference listed
      • Sullivan Co.
    		Meyers & Stewart, 1956. Geology of NH, Part III
    • Tennessee
      • Polk Co.
    		Travis A. Paris (2011) Tennessee mineral locality index. Rocks & Minerals, 86, #4, 300-328.
      • Union Co.
    		Travis A. Paris (2011) Tennessee mineral locality index. Rocks & Minerals, 86, #4, 300-328.
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