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Genthelvite

Big Photo

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

Show Genthelvite Photos (52)
Formula:
Zn
 
4
Be
 
3
[S|(SiO
 
4
)
 
3
]
System:IsometricColour:Colourless, white, ...
Hardness:6 - 6½
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.


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
mindat.org URL:http://www.mindat.org/min-1673.html
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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
[S|(SiO
 
4
)
 
3
]
Essential elements:Be, O, S, Si, Zn
All elements listed in formula:Be, O, S, Si, Zn
Analyical Data:Gelatinizes with acids
Common Impurities:Al,Fe,Mn,Cu
Relationship of Genthelvite to other Species
Series:Forms a series with Helvite (see here)
Forms a series with Danalite (see here)
Related Minerals - Nickel-Strunz Grouping):

- + 
9.FB.05Afghanite
(Na,Ca,K)
 
8
[(Cl
 
2
,SO
 
4
,CO
 
3
)
 
3
|Al
 
6
Si
 
6
O
 
24
] · 0.5H
 
2
O
9.FB.05Bystrite
(Na,K)
 
7
Ca[(S
 
3
)
 
1.5
|Al
 
6
Si
 
6
O
 
24
] · H
 
2
O
9.FB.05Cancrinite
Na
 
6
Ca
 
2
[(CO
 
3
)
 
2
|Al
 
6
Si
 
6
O
 
24
] · 2H
 
2
O
9.FB.05Cancrisilite
Na
 
7
[CO
 
3
|Al
 
5
Si
 
7
O
 
24
] · 3H
 
2
O
9.FB.05Davyne
(Na,K)
 
6
Ca
 
2
[(Cl
 
2
,SO
 
4
)
 
2
|Al
 
6
Si
 
6
O
 
24
]
9.FB.05Franzinite
(Na,K)
 
6
Ca
 
2
[(SO
 
4
)
 
2
|Al
 
6
Si
 
6
O
 
24
] · 0.5H
 
2
O
9.FB.05Giuseppettite
(Na,K,Ca)
 
7-8
[(SO
 
4
,Cl)
 
1-2
|Al
 
6
Si
 
6
O
 
24
]
9.FB.05Hydroxycancrinite
Na
 
8
[(OH)
 
2
|Al
 
6
Si
 
6
O
 
24
] · 2H
 
2
O
9.FB.05Liottite
(Na,K)
 
16
Ca
 
8
[Cl
 
4
|(SO
 
4
)
 
5
|(Al
 
6
Si
 
6
O
 
24
)
 
3
]
9.FB.05Microsommite
Na
 
4
K
 
2
Ca
 
2
[Cl
 
2
|SO
 
4
|Al
 
6
Si
 
6
O
 
24
]
9.FB.05Pitiglianoite
Na
 
6
K
 
2
[SO
 
4
|Al
 
6
Si
 
6
O
 
24
] · 2H
 
2
O
9.FB.05Quadridavyne
(Na,K)
 
6
Ca
 
2
[Cl
 
4
|Al
 
6
Si
 
6
O
 
24
]
9.FB.05Sacrofanite
(Na,Ca,K)
 
9
[{(OH)
 
2
,SO
 
4
,CO
 
3
,Cl
 
2
}
 
3
|Al
 
6
Si
 
6
O
 
24
] · 0.5H
 
2
O
9.FB.05Tounkite
(Na,Ca,K)
 
8
[Cl|(SO
 
4
)
 
2
|Al
 
6
Si
 
6
O
 
24
] · H
 
2
O
9.FB.05Vishnevite
(Na,K)
 
8
[(SO
 
4
,CO
 
3
)|Al
 
6
Si
 
6
O
 
24
] · 2H
 
2
O
9.FB.05Marinellite
(Na,K)
 
42
Ca
 
6
[Cl
 
2
|(SO
 
4
)
 
8
|(Al
 
6
Si
 
6
O
 
24
)
 
6
] · 3 H
 
2
O
9.FB.05Farneseite
(Na,Ca,K)
 
56
[(SO
 
4
)
 
12
|Al
 
42
Si
 
42
O
 
168
] · 6H
 
2
O
9.FB.05Alloriite
(Na,Ca,K)
 
26
Ca
 
4
[Cl
 
6
|(SO
 
4
)
 
6
|(Al
 
6
Si
 
6
O
 
24
)
 
4
]
9.FB.05IMA2008-006
[Na
 
82.5
Ca
 
33
K
 
16.5
]
 
132
(Si
 
99
Al
 
99
O
 
396
)(SO
 
4
)
 
33
·4H
 
2
O
9.FB.10Bicchulite
Ca
 
2
[(OH)
 
2
|Al
 
2
SiO
 
6
]
9.FB.10Danalite
Fe
2+
4
Be
 
3
[S|(SiO
 
4
)
 
3
]
9.FB.10Haüyne
(Na,Ca)
 
4-8
[Al
 
6
Si
 
6
(O,S)
 
24
](SO
 
4
,Cl)
 
1-2
9.FB.10Helvite
Mn
2+
4
Be
 
3
[S|(SiO
 
4
)
 
3
]
9.FB.10Kamaishilite
Ca
 
2
[(OH)
 
2
|Al
 
2
SiO
 
6
]
9.FB.10Lazurite
(Na,Ca)
 
8
[(S,SO
 
4
,Cl
 
2
)|Al
 
6
Si
 
6
O
 
24
]
9.FB.10Nosean
Na
 
8
[SO
 
4
|Al
 
6
Si
 
6
O
 
24
]
9.FB.10Sodalite
Na
 
8
[Cl
 
2
|Al
 
6
Si
 
6
O
 
24
]
9.FB.10Tsaregorodtsevite
N(CH
 
3
)
 
4
[AlSi
 
5
O
 
12
]
9.FB.10Tugtupite
Na
 
4
[Cl|BeAlSi
 
4
O
 
12
]
9.FB.10Helvine
9.FB.15Marialite
Na
 
4
[Cl|(AlSi
 
3
O
 
8
)
 
3
]
9.FB.15Meionite
Ca
 
4
[CO
 
3
|(Al
 
2
Si
 
2
O
 
8
)
 
3
]
9.FB.15Silvialite
(Ca,Na)
 
4
[(SO
 
4
,CO
 
3
)|(Al
 
2
Si
 
2
O
 
8
)
 
3
]
Related Minerals - Hey's Index Grouping:

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

- + 
76.2.4.1Helvite
Mn
2+
4
Be
 
3
[S|(SiO
 
4
)
 
3
]
Other Names for Genthelvite
Other Languages:
German:Genthelvit
Russian:Гентгельвин
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:American Mineralogist (1944): 29: 163-191.



American Mineralogist (1985): 70: 186-192.


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Internet Links for Genthelvite
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    Localities for Genthelvite
    






    


    

    
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    (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
    





    Canada
     
    

    • Québec
    

      • Rouville Co.
    

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

    • Etelä-Suomen Lääni
    

      • Southern Karelia
    

        • Wiborg
    
    		C. Lemanski, Jr. (re-entry of lost Mindat data).
    Greenland
     
    

    • Kitaa (West Greenland) Province
    

      • 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. 
    Japan
     
    

    • Honshu Island
    

      • Kinki Region
    

        • Kyoto Prefecture
    

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

    • Buskerud
    

      • Øvre Eiker
    

        • Gunhildrud
    

    

    • Oppland
    

      • Lunner
    

        • Nordmarka
    
    		G. Raade: "Gjerdingen-ekeritten, en unik mineralforekomst", Norsk Bergverksmuseum Skrift nr. 30, 2005, p17.
    

    • 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
    





    



        • Langesundsfjorden
    

    




    




Larsen,A.O.(1979):"Sorte granater fra Langesundsfjorden". NAGS-nytt 6(4), 15-16 (in norwegian)
    Pakistan
     
    

    • Federally Administered Tribal Areas (FATA)
    

      • Khyber Agency
    

        • Mulla Ghori
    
    		The Mineralogical Record, Volume 35 Number 3, p. 212
    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. 
    

    • Northern Region
    

      • Murmanskaja Oblast'
    

        • Kola Peninsula
    

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




          • Western Keivy Massif
    
    		Pavel M. Kartashov data
    Sweden
     
    

    • Södermanland
    

      • Haninge
    
    		Langhof, J., Holtstam, D. & Gustafsson, L., 2000: Chiavennite and zoned genthelvite-helvite as late-stage minerals of the Proterozoic LCT pegmatites at Utö, Stockholm, Sweden. GFF, Vol. 122 (Pt. 2, June), pp. 207-212. Stockholm. ISSN 1103-5897
    UK
     
    

    • England
    

      • Cornwall
    

        • Liskeard District
    

          • North Hill Area (North-Eastern Bodmin Moor)
    

            • Altarnun
    
    		No reference listed
    

    • Scotland
    

      • Buchan Grampian (Banffshire)
    

        • Cairngorm
    
    		[Specimen in the Natural History Museum, London]
    Ukraine
     
    

    • Zhytomyr Oblast' (Zhitomir Oblast')
    
    		P.M. Kartashov data
    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.
    

    • New Hampshire
    

      • Carroll Co.
    

        • Albany
    

          • Blackberry Crossing
    
    		Rocks & Minerals 80:4 pp242-261
    



        • Bartlett
    
    		Rocks&Min. 76:256
    


      • Grafton Co.
    

        • Bethlehem
    
    		Rocks & Minerals Vol.65 No.4
    

    • New Jersey
    

      • Sussex Co.
    

        • Franklin Mining District
    

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




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




www.franklinmineralmuseum.com
    




          • Ogdensburg
    

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

    • Rhode Island
    

      • Providence Co.
    

        • Cumberland
    
    		Miller, C. E. (1971) Rhode Island Minerals and their Localities, O. D. Hermes, Ed., University of Rhode Island, Kingston
    

    • Washington
    

      • Okanogan Co.
    

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

    


    

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