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Genthelvite

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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).



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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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Genthelvite details from Handbook of Mineralogy (PDF)
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  • Specimens:The following Genthelvite specimens are currently listed for sale on minfind.com.
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  • Localities for Genthelvite

    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.
    (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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    Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the 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 hundreds 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.
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