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Genthelvite

A valid IMA mineral species - grandfathered
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About GenthelviteHide

01797070014946651494722.jpg
Fredrick Augustus Genth
Formula:
Be3Zn4(SiO4)3S
Colour:
Colourless, white, yellow, green, pink to red, darkens to brown and black on weathering
Lustre:
Vitreous
Hardness:
6 - 6½
Specific Gravity:
3.44 - 3.70
Crystal System:
Isometric
Member of:
Name:
Named in 1944 by Jewel Jeannette Glass, Richard Henry Jahns, and Rollin Elbert Stevens for its relationship to helvine and for Fredrick Augustus Genth [May 17, 1820 Wächtersbach, Hesse-Cassel - February 2, 1893 Philadelphia, Pennsylvania, USA], professor of mineralogy at the University of Pennsylvania. 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. (1944) named the mineral after Genth in the reference listed on the genthelvite descriptive page - see Am. Min., 29, nos. 3 & 4, 163-191 (1944).

Unique IdentifiersHide

Mindat ID:
1673
Long-form identifier:
mindat:1:1:1673:1
GUID
(UUID V4):
88ab23c1-0b85-43ad-92e2-096fc9a40440

IMA Classification of GenthelviteHide

Approved, 'Grandfathered' (first described prior to 1959)

Classification of GenthelviteHide

9.FB.10

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
B : Tektosilicates with additional anions
Dana 7th ed.:
76.2.4.3
76.2.4.3

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species
17.9.3

17 : Silicates Containing other Anions
9 : Silicates with sulphide or sulphite

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
GhvIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
GhvThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Physical Properties of GenthelviteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless, white, yellow, green, pink to red, darkens to brown and black on weathering
Hardness:
6 - 6½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
on {111} and {111}
Fracture:
Irregular/Uneven
Density:
3.44 - 3.70 g/cm3 (Measured)    3.70 g/cm3 (Calculated)

Optical Data of GenthelviteHide

Type:
Isotropic
RI values:
nα = 1.738 - 1.752
Birefringence:
Isotropic minerals have no birefringence
Surface Relief:
Moderate

Chemistry of GenthelviteHide

Mindat Formula:
Be3Zn4(SiO4)3S
Common Impurities:
Al,Fe,Mn,Cu

Chemical AnalysisHide

Oxide wt%:
 1
SiO234.16 %
Al2O30.84 %
FeO0.08 %
ZnO46.12 %
BeO (calc.)11.99 %
CaO0.03 %
MnO5.61 %
S5.45 %
O=S-2.73 %
Total:101.55 %
Sample references:

Crystallography of GenthelviteHide

Crystal System:
Isometric
Class (H-M):
4 3m - Hextetrahedral
Space Group:
P4 3n
Cell Parameters:
a = 8.12(2) Å
Unit Cell V:
535.39 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals commonly tetrahedral and tristetrahedra, up to 5 cm in diameter; also as large rounded grains to 25cm

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000969GenthelviteHassan I, Grundy H D (1985) The crystal structures of helvite group minerals, (MnFeZn)8(Be6Si6O24)S2 American Mineralogist 70 186-19219850293
0000970GenthelviteHassan I, Grundy H D (1985) The crystal structures of helvite group minerals, (MnFeZn)8(Be6Si6O24)S2 American Mineralogist 70 186-19219850293
CIF Raw Data - click here to close

Epitaxial Relationships of GenthelviteHide

Epitaxial Minerals:
DanaliteBe3Fe2+4(SiO4)3S
Epitaxy Comments:
Genthelvite on danalite cores from Cheyenne Canyon, Colorado (Zito and Hanson, 2017).

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.320 Å(100)
1.916 Å(80)
2.168 Å(70)
2.567 Å(65)
1.657 Å(65)
1.483 Å(50)
1.435 Å(50)
Comments:
From Mt. Ste. Hilaire

Geological EnvironmentHide

Paragenetic Mode(s):
Geological Setting:
In miarolitic cavities in granitic pegmatites; accessory mineral in alkaline granites and syenites, greisens, and skarns.

Type Occurrence of GenthelviteHide

Place of Conservation of Type Material:
Pennsylvania State University, University Park, Pennsylvania; National Museum of Natural History, Washington, D.C., USA, #127180; The Natural History Museum, London, England, #1976,427
Geological Setting of Type Material:
Found in granite and syenite pegmatites

Other Language Names for GenthelviteHide

Relationship of Genthelvite to other SpeciesHide

Member of:
Other Members of this group:
DanaliteBe3Fe2+4(SiO4)3SIso. 4 3m : P4 3n
HelvineBe3Mn2+4(SiO4)3SIso. 4 3m : P4 3n
TugtupiteNa4BeAlSi4O12ClTet. 4 : I4
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
88 photos of Genthelvite associated with QuartzSiO2
57 photos of Genthelvite associated with AegirineNaFe3+Si2O6
40 photos of Genthelvite associated with CalciteCaCO3
36 photos of Genthelvite associated with AlbiteNa(AlSi3O8)
34 photos of Genthelvite associated with HelvineBe3Mn2+4(SiO4)3S
32 photos of Genthelvite associated with MicroclineK(AlSi3O8)
31 photos of Genthelvite associated with MagnetiteFe2+Fe3+2O4
25 photos of Genthelvite associated with CatapleiiteNa2Zr(Si3O9) · 2H2O
21 photos of Genthelvite associated with PolylithioniteKLi2Al(Si4O10)(F,OH)2
20 photos of Genthelvite associated with RhodochrositeMnCO3

Related Minerals - Strunz-mindat GroupingHide

9.FB.SteudeliteNa3(K17Ca7)Ca4(Al24Si24O96)(SO3)6F6 · 4H2OHex. 6 m2 : P62c
9.FB.SapozhnikoviteNa8(Al6Si6O24)(HS)2Iso. 4 3m : P4 3n
9.FB.BetziteNa6Ca2(Al6Si6O24)Cl4Hex. 6 : P63
9.FB.SlyudyankaiteNa28Ca4(Si24Al24O96)(SO4)6(S6)1/3(CO2) · 2H2OTric. 1 : P1
9.FB.Bolotinaite(Na7◻)(Al6Si6O24)F · 4H2OIso. 4 3m : I4 3m
9.FB.Wenlanzhangite-(Y)Y2V3+2V4+2(SiO4)2O4(OH)4Tric. 1 : P1
9.FB.05Afghanite(Na,K)22Ca10(Si24Al24O96)(SO4)6Cl6Trig. 3m : P3 1c
9.FB.05Bystrite(Na,K)7Ca(Al6Si6O24)(S5)ClTrig. 3m : P3 1c
9.FB.05Cancrinite(Na,Ca,◻)8(Al6Si6O24)(CO3,SO4)2 · 2H2OHex. 6 : P63
9.FB.05CancrisiliteNa7(Al5Si7O24)(CO3) · 3H2OHex. 6mm : P63mc
9.FB.05Davyne(Na,K)6Ca2(Al6Si6O24)(Cl2,SO4)2Hex. 6/m : P63/m
9.FB.05Franzinite(Na,K)6Ca2(Al6Si6O24)(SO4)2 · 0.5H2OHex.
9.FB.05Giuseppettite(Na,K,Ca)7-8(Al6Si6O24)(SO4,Cl)1-2Trig. 3m : P3 1c
9.FB.05HydroxycancriniteNa8(Al6Si6O24)(OH)2 · 2H2OHex. 6 : P63
9.FB.05Liottite(Na,K)16Ca8(Al6Si6O24)3(SO4)5Cl4Hex. 6 : P6
9.FB.05MicrosommiteNa4K2Ca2(Al6Si6O24)(SO4)Cl2Hex. 6 2 2 : P63 2 2
9.FB.05PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2OHex. 6 : P63
9.FB.05Quadridavyne(Na,K)6Ca2(Al6Si6O24)Cl4Hex. 6/m : P63/m
9.FB.05Sacrofanite(Na61K19Ca32)(Si84Al84O336)(SO4)26Cl2F6 · 2H2OHex.
9.FB.05Tounkite(Na,Ca,K)8(Al6Si6O24)(SO4)2Cl · H2OHex. 6 2 2 : P62 2 2
9.FB.05Vishnevite(Na,K)8(Al6Si6O24)(SO4,CO3) · 2H2OHex. 6 : P63
9.FB.05Marinellite(Na,K)42Ca6(Al6Si6O24)6(SO4)8Cl2 · 3H2OTrig. 3m : P3 1c
9.FB.05Farneseite(Na,Ca,K)56(Al6Si6O24)7(SO4)12 · 6H2OHex. 6/m : P63/m
9.FB.05Alloriite(Na,Ca,K)26Ca4(Al6Si6O24)4(SO4)6Cl6Trig. 3m : P3 1c
9.FB.05Biachellaite(Na,Ca,K)8(Al6Si6O24)(SO4)2(OH)0.5 · H2OTrig. 3 : P3
9.FB.05Fantappièite[Na82.5Ca33K16.5](Si99Al99O396)(SO4)33 · 4H2OTrig. 3 : R3
9.FB.05KyanoxaliteNa7(Al6-xSi6+xO24)(C2O4)0.5+x · 5H2O (0 < x < 0.5)Hex. 6 : P63
9.FB.05Balliranoite(Na,K)6Ca2(Si6Al6O24)Cl2(CO3)Hex. 6 : P63
9.FB.05CarbobystriteNa8(Al6Si6O24)(CO3) · 3.5H2OTrig. 3m : P3 1c
9.FB.05DepmeieriteNa8(Al6Si6O24)(PO4,CO3)1-x · 3H2O (xHex. 6 : P63
9.FB.05KircheriteNa5Ca2K(Al6Si6O24)(SO4)2 · 0.33H2OTrig. 3 2 : R3 2
9.FB.05SulfhydrylbystriteNa5K2Ca[Al6Si6O24](S5)2(SH)Trig. 3m : P3 1c
9.FB.10BicchuliteCa2(Al2SiO6)(OH)2Iso. 4 3m : I4 3m
9.FB.10DanaliteBe3Fe2+4(SiO4)3SIso. 4 3m : P4 3n
9.FB.10 vaHackmaniteNa8Al6Si6O24(Cl2,S)
9.FB.10HaüyneNa3Ca(Si3Al3)O12(SO4)Iso. 4 3m : P4 3n
9.FB.10HelvineBe3Mn2+4(SiO4)3SIso. 4 3m : P4 3n
9.FB.10KamaishiliteCa2(Al2SiO6)(OH)2Tet.
9.FB.10LazuriteNa7Ca(Al6Si6O24)(SO4)(S3) · H2OIso. 4 3m : P4 3n
9.FB.10NoseanNa8(Al6Si6O24)(SO4) · H2OIso. 4 3m : P4 3n
9.FB.10SodaliteNa4(Si3Al3)O12ClIso. 4 3m : P4 3n
9.FB.10Tsaregorodtsevite(N(CH3)4)(AlSi5O12)Orth. 2 2 2 : I2 2 2
9.FB.10TugtupiteNa4BeAlSi4O12ClTet. 4 : I4
9.FB.10VladimirivanoviteNa6Ca2(Al6Si6O24)(SO4,S3,S2,Cl)2 · H2OOrth. mmm (2/m 2/m 2/m)
9.FB.15MarialiteNa4Al3Si9O24ClTet. 4/m : I4/m
9.FB.15MeioniteCa4Al6Si6O24CO3Tet. 4/m : I4/m
9.FB.15Silvialite(Ca,Na)4(Al6Si6O24)(SO4,CO3)Tet. 4/m : I4/m

Fluorescence of GenthelviteHide

Strong green fluorescence in long- and short-wave ultraviolet; short-lived phosphorescence.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for GenthelviteHide

References for GenthelviteHide

Reference List:

Localities for GenthelviteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Argentina
 
  • Córdoba Province
    • Punilla Department
      • San Roque District
        • Tanti
Dina (1993)
Černý et al. (2003) +1 other reference
Brazil
 
  • Amazonas
    • Presidente Figueiredo
      • Pitinga mine
A. C. Bastos Neto et al. (2009)
  • Goiás
    • Teresina de Goiás
Miranda (2018)
Raimbault et al. (1993)
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
166-175. +3 other references
China
 
  • Heilongjiang
    • Qiqihaer
Xiaoshi Ding et al. (1981)
  • Inner Mongolia
    • Chifeng City (Ulanhad League; Chifeng Prefecture)
      • Hexigten Banner (Keshiketeng Co.)
Ottens (2011) +1 other reference
    • Tongliao City (Tongliao Prefecture)
      • Jarud Banner (Zalute Co.)
Qiu et al. (2019) +1 other reference
Zhongxin Yuan and Ge Bai (1997)
Zhang +4 other references
  • Yunnan
    • Honghe
      • Gejiu City
        • Gejiu Sn-polymetallic ore field
Baogui Zhang et al. (2002)
Finland
 
  • Kymenlaakso
    • Kotka
Haapala
  • Satakunta
Haapala Ilmari 1977 Petrography and ... +1 other reference
Al-Ani
      • Väkkärä
Haapala et al. (1972)
Finland/Russia
 
  • Wyborg batholith
Al-Ani et al. (2018)
Haapala et al. (2005)
Germany
 
  • Saxony
    • Görlitz District
      • Vierkirchen
        • Döbschütz
WITZKE et al. (2014)
Greenland
 
  • Kujalleq
    • Igaliku Complex
Finch (1990)
Finch (1990)
Petersen (2001)
Bohse et al. (2001)
Italy
 
  • Trentino-Alto Adige (Trentino-South Tyrol)
    • South Tyrol
      • Wipptal (Alta Vall'Isarco)
        • Pfitsch (Val di Vizze)
          • Sankt Jakob (San Giacomo)
• Gartner et al. (2005)
Folie et al. (2004) +2 other references
Japan
 
  • Kyoto Prefecture
    • Kameoka City
Tsuruta et al. (2005)
Kazakhstan
 
  • Karaganda Region
    • Karkaraly
Evseev (1995) +1 other reference
Kyrgyzstan
 
  • Talas Region
    • Ak-Tyuz ore Field
N. MALYUKOVA (2014)
Malawi
 
  • Southern Region
    • Zomba
Lapis 29 (1)
Mongolia
 
  • Khovd Province
    • Myangad District
Pavel.M. Kartashov (n.d.)
Kovalenko et al. (1995)
        • Mount Ulyn Khuren
Kartashov P.M. et al. (Mongolian Altai)
Econ Geol (1995) +1 other reference
Niger
 
  • Agadez
    • Aïr Mountains
      • South Aïr
Wolley (2001)
    • Tchirozerine
consequences. Bulletin de la Société géologique de France (6) +4 other references
Nigeria
 
  • Plateau
    • Jos Plateau
      • Younger ring complex
Von Knorring et al. (1959)
Norway
 
  • Buskerud
    • Øvre Eiker
      • Gunhildrud
Jahren et al. (1998)
Neumann (1985) +1 other reference
  • Nordland
    • Hamarøy
Husdal (2021)
    • Rana
      • Høgtuva
Grauch et al. (1994)
  • Telemark
    • Porsgrunn
Larsen (1988)
  • Vestfold
    • Larvik
      • Hedrum
        • Lågendalen
Oftedal et al. (1963) +1 other reference
Larsen et al. (2010)
Larsen et al. (2010)
      • Stokkøya
Larsen (1988)
  • Viken
    • Lunner
Raade (2005) +1 other reference
Pakistan
 
  • Gilgit-Baltistan
    • Shigar District
Herb Obodda collection +1 other reference
imported from Shigar District +1 other reference
  • Khyber Pakhtunkhwa Province
    • Peshawar District
      • Hameed Abad Kafoor Dheri
The Mineralogical Record +2 other references
Poland
 
  • Lower Silesian Voivodeship
    • Dzierżoniów County
      • Piława Górna
        • DSS Piława Górna Quarry
Pieczka et al. (2018)
Romania
 
  • Suceava County
    • Iacobeni
minerals-of-the-carpathians.eu (2008)
      • Tolovanu
Hîrtopanu (1997) +1 other reference
Russia
 
  • Murmansk Oblast
    • Lovozersky District
      • Keivy Mountains
        • Western Keivy Massif
Voloshin et al. (2007)
Voloshin et al. (2007)
Pavel.M. Kartashov (n.d.)
Luntz et al. (1972)
[World of Stones 95:5-6
  • Republic of Karelia
Ivashchenko et al. (2006)
[World of Stones 12:49]
  • Tuva
    • Sangilen Upland
Kapustin et al. (1965)
Switzerland
 
  • Valais
    • Östlich Raron
      • Grengiols
        • Chummibort
Cuchet et al. (2014)
Cuchet et al. (2014)
UK
 
  • England
    • Cornwall
      • Altarnun
Kingsbury (1961) +2 other references
  • Scotland
    • Highland
      • Fort William and Ardnamurchan
[Specimen in the Natural History Museum +4 other references
Ukraine
 
  • Zhytomyr Oblast
    • Korosten Raion
Bailey +3 other references
USA
 
  • Colorado
    • El Paso County
      • Cheyenne Mining District (St. Peters Dome Mining District)
Pearl (1958) +1 other reference
Eckel et al. (1997)
Eckel et al. (1997)
      • Crystal Park
Eckel et al. (1997)
Eckel et al. (1997)
Eckel et al. (1997)
    • Teller County
      • Crystal Peak
Joseph Dorris (2011) +1 other reference
  • Massachusetts
    • Essex County
Dunn (1976)
  • New Hampshire
    • Carroll County
      • Albany
        • Blue Mountain
Rocks & Minerals 80:4 pp242-261
      • Bartlett
Rocks&Min. 76:256 +1 other reference
    • Grafton County
      • Bethlehem
Rocks & Minerals Vol.65 No.4 +2 other references
  • New Jersey
    • Sussex County
      • Franklin
Cianciulli (2005)
Essene et al. (1987) +1 other reference
www.franklinmineralmuseum.com
      • Ogdensburg
        • Sterling Hill
John Cianciulli +2 other references
  • Rhode Island
    • Providence County
personal identification
Miller (1971) +1 other reference
personal identification by Fred ...
Peter Dunn (1976)
  • Washington
    • Okanogan County
      • Golden Horn Batholith
Saul Krotki field trip. Species verified +1 other reference
Zambia
 
  • Central Province
    • Chibombo District
Maria Boni et al. (2011)
  • Lusaka Province
    • Chilanga District
Maria Boni et al. (2011)
 
Mineral and/or Locality  
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