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Genthelvite

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Big Photo

Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada
© D. Richerson

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Formula:
Zn
 
4
(Be
 
3
Si
 
3
O
 
12
)S
System:IsometricColour:Colourless, white, ...
Hardness:6 - 6½
Member of:Helvine Group
Name:Named in 1944 by Glass, et. al. for its relationship to helvite and for Fredrick August Ludwig Karl Wilhelm Genth (1820-1893), German-American chemist and mineralogist.Genth first described genthelvite in 1892 but did not recommend a name. Genth's description appears in Am. Jour. Sci., 44, 385 (1892). Glass, et.al., named the mineral after Genth in the reference listed on the genthelvite descriptive page - Am. Min., 29, Nos. 3 & 4, 163-191 (1944).




Helvite Group. Danalite-Genthelvite Series, Danalite-Helvite Series, and the Genthelvite-Helvite Series.

Classification of Genthelvite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/J.12-30
Nickel-Strunz 10th (pending) edition ID:9.FB.10

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
B : Tektosilicates with additional anions
Dana 7th edition ID:76.2.4.3
Dana 8th edition ID:76.2.4.3

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species
Hey's CIM Ref.:17.9.3

17 : Silicates Containing other Anions
9 : Silicates with sulphide or sulphite
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Type Occurrence of Genthelvite

Type Locality:West Cheyenne Canon, Cheyenne District (St. Peters Dome District), El Paso Co., Colorado, USA
Year of Discovery:1944
Geological Setting of type material:Found in granite and syenite pegmatites

Physical Properties of Genthelvite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Colourless, white, yellow, green, pink to red, darkens to brown and black on weathering
Hardness (Mohs):6 - 6½
Tenacity:Brittle
Fracture:Irregular/Uneven

Crystallography of Genthelvite

Crystal System:Isometric
Class (H-M):4 3m - Hextetrahedral
Space Group:P4 3n
Cell Parameters:a = 8.12Å
Unit Cell Volume:V 535.39 ų (Calculated from Unit Cell)
Morphology:Crystals commonly tetrahedral, up to 5 cm in diameter; also as large rounded grains

Optical Data of Genthelvite

Type:Isotropic

Chemical Properties of Genthelvite

Formula:
Zn
 
4
(Be
 
3
Si
 
3
O
 
12
)S
Essential elements:Be, O, S, Si, Zn
All elements listed in formula:Be, O, S, Si, Zn
Analytical Data:Gelatinizes with acids
Common Impurities:Al,Fe,Mn,Cu
Relationship of Genthelvite to other Species
Series:Forms a series with Helvine (see here)
Forms a series with Danalite (see here)
Member of:Helvine Group
Other Members of Group:

- + 
Danalite
Fe
2+
4
(Be
 
3
Si
 
3
O
 
12
)S
Helvine
Mn
2+
4
(Be
 
3
Si
 
3
O
 
12
)S
Related Minerals - Nickel-Strunz Grouping):

- + 
9.FB.05Afghanite
(Na,Ca,K)
 
8
(Al
 
6
Si
 
6
O
 
24
)(Cl
 
2
,SO
 
4
,CO
 
3
)
 
3
 · 0.5H
 
2
O
9.FB.05Bystrite
(Na,K)
 
7
Ca(Al
 
6
Si
 
6
O
 
24
)(S
 
3
)
 
1.5
 · H
 
2
O
9.FB.05Cancrinite
(Na,Ca,☐)
 
8
(Al
 
6
Si
 
6
O
 
24
)(CO
 
3
,SO
 
4
)
 
2
 · 2H
 
2
O
9.FB.05Cancrisilite
Na
 
7
(Al
 
5
Si
 
7
O
 
24
)(CO
 
3
) · 3H
 
2
O
9.FB.05Davyne
(Na,K)
 
6
Ca
 
2
(Al
 
6
Si
 
6
O
 
24
)(Cl
 
2
,SO
 
4
)
 
2
9.FB.05Franzinite
(Na,K)
 
6
Ca
 
2
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
)
 
2
 · 0.5H
 
2
O
9.FB.05Giuseppettite
(Na,K,Ca)
 
7-8
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
,Cl)
 
1-2
9.FB.05Hydroxycancrinite
Na
 
8
(Al
 
6
Si
 
6
O
 
24
)(OH)
 
2
 · 2H
 
2
O
9.FB.05Liottite
(Na,K)
 
16
Ca
 
8
(Al
 
6
Si
 
6
O
 
24
)
 
3
(SO
 
4
)
 
5
Cl
 
4
9.FB.05Microsommite
Na
 
4
K
 
2
Ca
 
2
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
)Cl
 
2
9.FB.05Pitiglianoite
Na
 
6
K
 
2
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
) · 2H
 
2
O
9.FB.05Quadridavyne
(Na,K)
 
6
Ca
 
2
(Al
 
6
Si
 
6
O
 
24
)Cl
 
4
9.FB.05Sacrofanite
(Na,K)
 
98
Ca
 
20
(Al
 
6
Si
 
6
O
 
24
)
 
14
(SO
 
4
)
 
26
Cl
 
2
 · 8H
 
2
O
9.FB.05Tounkite
(Na,Ca,K)
 
8
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
)
 
2
Cl · H
 
2
O
9.FB.05Vishnevite
(Na,K)
 
8
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
,CO
 
3
) · 2H
 
2
O
9.FB.05Marinellite
(Na,K)
 
42
Ca
 
6
(Al
 
6
Si
 
6
O
 
24
)
 
6
(SO
 
4
)
 
8
Cl
 
2
 · 3H
 
2
O
9.FB.05Farneseite
(Na,Ca,K)
 
56
(Al
 
6
Si
 
6
O
 
24
)
 
7
(SO
 
4
)
 
12
 · 6H
 
2
O
9.FB.05Alloriite
(Na,Ca,K)
 
26
Ca
 
4
(Al
 
6
Si
 
6
O
 
24
)
 
4
(SO
 
4
)
 
6
Cl
 
6
9.FB.05Fantappièite
[Na
 
82.5
Ca
 
33
K
 
16.5
](Si
 
99
Al
 
99
O
 
396
)(SO
 
4
)
 
33
 · 4H
 
2
O
9.FB.05Kyanoxalite
Na
 
7
(Al
 
6-x
Si
 
6+x
O
 
24
)(C
 
2
O
 
4
)
 
0.5+x
 · 5H
 
2
O   (0 < x < 0.5)
9.FB.05Balliranoite
(Na,K)
 
6
Ca
 
2
(Si
 
6
Al
 
6
O
 
24
)Cl
 
2
(CO
 
3
)
9.FB.05Carbobystrite
Na
 
8
(Al
 
6
Si
 
6
O
 
24
)(CO
 
3
) · 3.5H
 
2
O
9.FB.05Depmeierite
Na
 
8
(Al
 
6
Si
 
6
O
 
24
)(PO
 
4
,CO
 
3
)
 
1-x
  · 3H
 
2
O (x<0.5)
9.FB.05Kircherite
Na
 
5
Ca
 
2
K(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
)
 
2
 · 0.33H
 
2
O
9.FB.10Bicchulite
Ca
 
2
(Al
 
2
SiO
 
6
)(OH)
 
2
9.FB.10Danalite
Fe
2+
4
(Be
 
3
Si
 
3
O
 
12
)S
9.FB.10Haüyne
(Na,Ca)
 
4-8
(Al
 
6
Si
 
6
(O,S)
 
24
)(SO
 
4
,Cl)
 
1-2
9.FB.10Helvine
Mn
2+
4
(Be
 
3
Si
 
3
O
 
12
)S
9.FB.10Kamaishilite
Ca
 
2
(Al
 
2
SiO
 
6
)(OH)
 
2
9.FB.10Lazurite
(Na,Ca)
 
8
(Al
 
6
Si
 
6
O
 
24
)(S,SO
 
4
,Cl
 
2
)
9.FB.10Nosean
Na
 
8
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
)
9.FB.10Sodalite
Na
 
8
(Al
 
6
Si
 
6
O
 
24
)Cl
 
2
9.FB.10Tsaregorodtsevite
(N(CH
 
3
)
 
4
)(AlSi
 
5
O
 
12
)
9.FB.10Tugtupite
Na
 
4
(AlBeSi
 
4
O
 
12
)Cl
9.FB.15Marialite
Na
 
4
Al
 
3
Si
 
9
O
 
24
Cl
9.FB.15Meionite
Ca
 
4
Al
 
6
Si
 
6
O
 
24
CO
 
3
9.FB.15Silvialite
(Ca,Na)
 
4
(Al
 
6
Si
 
6
O
 
24
)(SO
 
4
,CO
 
3
)
Related Minerals - Hey's Index Grouping:

- + 
17.9.1Lazurite
(Na,Ca)
 
8
(Al
 
6
Si
 
6
O
 
24
)(S,SO
 
4
,Cl
 
2
)
17.9.2Jasmundite
Ca
 
11
(SiO
 
4
)
 
4
O
 
2
S
17.9.4Helvine
Mn
2+
4
(Be
 
3
Si
 
3
O
 
12
)S
17.9.5Danalite
Fe
2+
4
(Be
 
3
Si
 
3
O
 
12
)S
Related Minerals - Dana Grouping):

- + 
76.2.4.1Helvine
Mn
2+
4
(Be
 
3
Si
 
3
O
 
12
)S
Other Names for Genthelvite
Other Languages:
German:Genthelvin
Genthelvit
Russian:Гентгельвин
Simplified Chinese:锌日光榴石
Spanish:Genthelvita
Other Information
Fluorescence in UV light:Strong green fluorescence in long- and short-wave ultraviolet; short-lived phosphorescence.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
References for Genthelvite
Reference List:

- + 
Genth, Am. Jour. Sci., 44, 385 (1892)

American Mineralogist (1944): 29: 163-191.



American Mineralogist (1985): 70: 186-192.
Internet Links for Genthelvite
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    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.

    Argentina
     
    

    • Córdoba
    

      • Punilla Department
    

        • Tanti
    
    		J.C. Lodovichi collection
    





    Brazil
     
    

    • Amazonas
    

      • Presidente Figueiredo
    

        • Pitinga mine
    
    		A. C. Bastos Neto, V. P. Pereira, L. H. Ronchi, E. F. de Lima and J. C. Frantz (2009): The world-class Sn, Nb, Ta, F (Y, REE, Li) deposit and the massive cryolite associated with the albite-enriched facies of the Madeira A-type granite, Pitinga mining district, Amazonas State, Brazil. Canadian Mineralogist 47, 1329-1357.
    

    • Goiás
    

      • Cavalcante
    

        • Vaca Velha
    
    		Raimbault, L. and Bilal, E. (1993) Trace-element contents of helvite-group minerals from metasomatic albitites and hydrothermal veins at Sucuri, Brazil, and Dajishan, China. Canadian Mineralogist, 31, 119-127.
    Canada
     
    

    • Québec
    

      • Montérégie
    

        • Rouville RCM
    

          • Mont Saint-Hilaire
    
    		Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.; Mineralogical Record (2001) 32:248
    China
     
    

    • Heilongjiang Province (Manchuria; Dongbei Region)
    

      • Qiqihaer Prefecture
    

        • Greater Hinggan Mts (Greater Khingan Mts)
    
    		Xiaoshi Ding, Ge Bai, Zhongxian Yuan, and Luren Sun (1981): Geological Review 46(5), 459-466
    

    • Inner Mongolia Autonomous Region
    

      • Tongliao League (Tongliao Prefecture)
    

        • Jarud Banner (Zalute Co.)
    

          • Baerzhe complex
    
    		Zhongxin Yuan and Ge Bai (1997): Geology and Prospecting 33(1), 42-48
    


      • Ulanhad League (Chifeng Prefecture)
    

        • Hexigten Banner (Keshiketeng Co.)
    
    		Ottens, B. (2011): Lapis 36(9), 27-33; Ottens, B. and G. Neumeier (2012) The Huanggang Mine, Inner Mongolia, China. Mineralogical Record 43:529-563
    

    • Yunnan Province
    

      • Honghe Autonomous Prefecture
    

        • Gejiu Co.
    

          • Gejiu Sn-polymetallic ore field
    

            • Eastern Sub-district
    
    		Baogui Zhang, Zhong Zhang, Linbo Yao, Jing Hu, Mingzai Wang, and Sanxue Wang (2002): Geology and Prospecting 38(6), 30-33
    Greenland
     
    

    • Kitaa (West Greenland) Province
    

      • Narsaq
    

        • Igaliku (Igaliko)
    

          • Narssârssuk (Narsarsuk)
    
    		Adrian A. Finch (1990) Genthelvite and Willemite, Zinc Minerals Associated with Alkaline Magmatism from the Motzfeldt Centre, South Greenland. Mineralogical Magazine 54:407-412
    

    • Kitaa Province (West Greenland)
    

      • Narsaq
    

        • Ilimaussaq complex
    

          • Tasseq area
    
    		Bohse, H., Petersen, O., Niedermayr, G. (2001): Notes on Leucophanite from the Ilimaussaq alkaline complex, South Greenland, Geology of Greenland Survey Bulletin, 190, 119-121
    Italy
     
    

    • Trentino-Alto Adige
    

      • Bolzano Province (South Tyrol)
    

        • Vizze Valley (Pfitsch Valley)
    

          • San Giacomo
    
    		• Gartner, A. & Weiss, S. (2005): Blauer Genthelvin aus Südtirol – ein sensationeller Fund. Lapis, 30(10), 20-23. • Folie, K., Moro, M., Perugini, A., Rocchetti, I. (2004): Genthelvin vom Pfitscher Joch - ein seltenes Vorkommen in den Alpen. Mineralien-Welt, 15(3), 74-75. 
    





Folie, K., P. Gentile, M. Hanke & I. Rocchetti (2010): Mineralien aus der Umgebung des Pfitscher Jochs in Südtirol (II). Mineralien-Welt 21 (4), 42-67.
    Japan
     
    

    • Honshu Island
    

      • Kinki Region
    

        • Kyoto Prefecture
    

          • Kameoka City
    
    		Tsuruta et al. (2005) Koubutsu-Gakkai Kou'en-Youshi, 146.
    Kazakhstan
     
    

    • Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
    
    		http://geo.web.ru/druza/l-Kent.htm
    Malawi
     
    

    • Zomba District
    
    		Lapis 29(1), 37-38 (2004)
    Mongolia
     
    

    • Hovd Aimag (Khovd Aimag)
    

      • Altai Mts
    
    		P.M. Kartashov data
    




          • Mount Ulyn Khuren
    
    		Kartashov P.M., Voloshin A.V., PakhomovskiiYa.A. On the zonal crystaline gadolinite from the alkaline granite pegmatites of Haldzan Buragtag (Mongolian Altai), - Zapiski VMO, 1993,N3,p. 65-79.
    



Econ Geol (1995) 90:530-547
    Niger
     
    

    • Agadez Department
    

      • Aïr Region
    

        • South Aïr
    
    		Wolley, A.R. (2001): Alkaline Rocks and Carbonatites of the World: Africa.- The Geological Society, London
    Nigeria
     
    

    • Plateau State
    

      • Jos Plateau
    

        • Younger ring complex
    
    		Am. Min. 44, 1294
    Norway
     
    

    • Buskerud
    

      • Øvre Eiker
    

        • Gunhildrud
    
    		Jahren, J.; Berg, H.J.; Hurum, J.H. & Wulff-Pedersen, E. (1998): Nye undersøkelser av amazonitt-genthelvin pegmatitten fra Fiskum, Øvre Eiker. Bergverksmuseets Skrift 14, 13-16
    


Neumann, H. (1985): Norges Mineraler. Norges geologiske Undersøkelse Skrifter 68, p.238
    

    • Nordland
    

      • Rana
    
    		Grauch et al. (1994): Høgtuvaite, a new beryllian member of the aenigmatite group fom Norway, with x-ray data on aenigmatite. Canadian Mineralogist. 32: 439-448.
    

    • Oppland
    

      • Lunner
    

        • Nordmarka
    
    		Raade, G. (2005): Gjerdingen-ekeritten, en unik mineralforekomst. Norsk Bergverksmuseum Skrift nr. 30, 2005, p 17.
    

    • Telemark
    

      • Porsgrunn
    

        • Langesundsfjorden
    
    		Larsen, A. O. (1988): Helvite group minerals from syenite pegmatites in the Oslo Region, Norway. Contribution to the mineralogy of Norway no 68. Norsk Geologisk Tidsskrift 68: 119-124
    

    • Vestfold
    

      • Larvik
    

        • Hedrum
    

          • Lågendalen
    
    		Oftedal, I. & Sæbø, P.Chr. (1963): Contributions to the mineralogy of Norway No.18. Classification of some Norwegian members of the Helvine group. Norsk Geologisk Tidsskrift 43, 405-409;Larsen, A. O. (1988): Helvite group minerals from syenite pegmatites in the Oslo Region, Norway. Contribution to the mineralogy of Norway no 68. Norsk Geologisk Tidsskrift 68: 119-124 
    



        • Langesundsfjorden
    
    		Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 p
    



Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 p ( p.134)
    




          • Stokkøya (Stokø; Stockö; Stocköe)
    
    		Larsen, A. O. (1988): Helvite group minerals from syenite pegmatites in the Oslo Region, Norway. Contribution to the mineralogy of Norway no 68. Norsk Geologisk Tidsskrift 68: 119-124

    Pakistan
     
    

    • Khyber Pakhtunkhwa (North-West Frontier Province)
    

      • Peshawar
    

        • Hameed Abad Kafoor Dheri
    
    		The Mineralogical Record, Volume 35 Number 3, p. 212
    Romania
     
    

    • Suceava Co.
    

      • Suceava district
    

        • Iacobeni (Jakobeny; Jacobeny; Jakabfalva)
    
    		http://minerals-of-the-carpathians.eu
    Russia
     
    

    • Eastern-Siberian Region
    

      • Saha Republic (Sakha Republic; Yakutia)
    
    		[World of Stones 12:49]
    


      • Tuva Republic
    

        • Sangilen Upland
    
    		Kapustin, Y. L., & Bykova, A. V. (1965). First find of hiortdahlite in the USSR. Doklady Akad. Nauk SSSR, 161, 121-124. 
    

    • North-Western Region
    

      • Leningradskaya Oblast'
    

        • Wyborg (Vyborg; Wiborg)
    

          • Wyborg batholith
    

            • Kymi intrusion
    
    		C. Lemanski, Jr. (re-entry of lost Mindat data).
    

    • Northern Region
    

      • Murmanskaja Oblast'
    

        • Kola Peninsula
    

          • Keivy Mountains
    

            • Western Keivy Massif
    
    		Pavel M. Kartashov data
    




          • Lovozero Massif
    
    		[World of Stones 95:5-6, p64]
    UK
     
    

    • England
    

      • Cornwall
    

        • Liskeard District
    

          • Altarnun
    
    		No reference listed
    

    • Scotland
    

      • Buchan Grampian (Banffshire)
    

        • Cairngorm
    
    		[Specimen in the Natural History Museum, London]; Mineralogical Magazine 1967 36 : 60-63
    Ukraine
     
    

    • Zhytomyr Oblast' (Zhitomir Oblast')
    
    		Bailey, J. C: Formation of cryolite and other aluminofluorides: A petrologic review. Bull. geol. Soc. Denmark, vol. 29, pp. 1-45. Copenhagen, June 10th, 1980.
    USA
     
    

    • Colorado
    

      • El Paso Co.
    

        • Cheyenne District (St. Peters Dome District)
    
    		Pearl, 1958. Colorado Gem Trails & Mineral Guide
    




Minerals of Colorado (1997) Eckels, E. B.
    



Minerals of Colorado (1997) Eckel, E. B.
    



        • Crystal Park
    
    		Minerals of Colorado (1997) Eckels, E. B.
    


"Minerals of Colorado, updated & revised", p. 14, by Eckel, Edwin B., 1997
    



Minerals of Colorado (1997) Eckels, E. B.
    


      • Teller Co.
    

        • Crystal Peak area
    
    		Joseph Dorris (2011) Mineral News, 27, #8, 8.
    

    • Massachusetts
    

      • Essex Co.
    
    		Dunn, P. (1976): Genthelvite and the helvine group (Mineralogical Magazine 40:627-636).
    

    • New Hampshire
    

      • Carroll Co.
    

        • Albany
    

          • SSW of Blackberry Crossing
    

            • Blue Mountain
    
    		Rocks & Minerals 80:4 pp242-261
    



        • Bartlett
    
    		Rocks&Min. 76:256
    


      • Grafton Co.
    

        • Bethlehem
    
    		Rocks & Minerals Vol.65 No.4; Rocks & Minerals (2005) 80:242-261 New Hampshire Mineral Locality Index
    

    • New Jersey
    

      • Sussex Co.
    

        • Franklin Mining District
    

          • Franklin
    
    		Cianciulli, J. (2005): Genthelvite from the Franklin Mine. Mineral News, 21, 10-11
    





Essene, E.J. & Peacor, D.R.: Petedunnite...: Am. Min.:72:157-166 (1987); Dunn(1995):Pt3:369.
    





www.franklinmineralmuseum.com
    




          • Ogdensburg
    

            • Sterling Hill
    
    		John Cianciulli, Curator, Franklin Mineral Museum; Mr. Mark Boyer
    

    • Rhode Island
    

      • Providence Co.
    
    		personal identification
    



Miller, C. E. (1971) Rhode Island Minerals and their Localities, O. D. Hermes, Ed., University of Rhode Island, Kingston; Rocks & Minerals (1986) 61:264-275
    



personal identification by Fred Schuster.
    



Peter Dunn (1976) Genthelvite and the helvine group. Mineralogical Magazine, 4O:627-636
    

    • Washington
    

      • Okanogan Co.
    

        • Golden Horn Batholith
    
    		Saul Krotki field trip. Species verified, Cannon Microprobe, EDS spectral analysis, Novermber 2008.; Saul Krotki Collection and data
    Zambia
     
    

    • Lusaka Province
    

      • Lusaka
    
    		Maria Boni, Rosario Terracciano, Giuseppina Balassone, Sarah A. Gleeson und Alexander Matthews (2011): The carbonate-hosted willemite prospects of the Zambezi Metamorphic Belt (Zambia). Mineralium Deposita 46, 707-729.
    


Maria Boni, Rosario Terracciano, Giuseppina Balassone, Sarah A. Gleeson und Alexander Matthews (2011): The carbonate-hosted willemite prospects of the Zambezi Metamorphic Belt (Zambia). Mineralium Deposita 46, 707-729.
    

    


    

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