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Demantoid

This page kindly sponsored by The Mineralogy Society of Hong Kong
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About DemantoidHide

Formula:
Ca3Fe3+2(SiO4)3
Name:
Named by Nils Gustaf Nordenskiøld from the archaic German word "Demant" which means "diamond" in allusion to its very high brilliance resembling that of diamond.
A variety of Andradite

Garnet group.

A green variety of Andradite.
Originally described from Telyanskaya River, Kamennaya Telyana, Nizhnii-Tagil (Mednorudyanskoye) Cu Deposit, Nizhnii Tagil, Sverdlovskaya Oblast', Urals Region, Russia (https://www.mindat.org/loc-2803.html).

Visit gemdat.org for gemological information about Demantoid.


Pronounciation of DemantoidHide

Pronounciation:
PlayRecorded byCountry
Debbie WoolfUnited Kingdom

Chemical Properties of DemantoidHide

Formula:
Ca3Fe3+2(SiO4)3

Other Language Names for DemantoidHide

Simplified Chinese:翠榴石

Common AssociatesHide

Associated Minerals Based on Photo Data:
Amphibole Supergroup65 photos of Demantoid associated with Amphibole Supergroup on mindat.org.
Quartz32 photos of Demantoid associated with Quartz on mindat.org.
Asbestos24 photos of Demantoid associated with Asbestos on mindat.org.
Chrysotile19 photos of Demantoid associated with Chrysotile on mindat.org.
Topazolite7 photos of Demantoid associated with Topazolite on mindat.org.
Andradite6 photos of Demantoid associated with Andradite on mindat.org.
Stilbite subgroup5 photos of Demantoid associated with Stilbite subgroup on mindat.org.
Garnet Group3 photos of Demantoid associated with Garnet Group on mindat.org.
Sepiolite3 photos of Demantoid associated with Sepiolite on mindat.org.
Uvarovite3 photos of Demantoid associated with Uvarovite on mindat.org.

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 DemantoidHide

Localities for DemantoidHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Afghanistan
 
Rob Lavinsky specimen
Andrew Debnam collection
Argentina
 
  • Mendoza
    • Malargüe Department
      • Morro de Yeso
Dr. Jorge Dascal and Gunnar Färber specimens
Canada
 
  • Québec
    • Chaudière-Appalaches
      • Les Appalaches RCM
        • Saint-Joseph-de-Coleraine
Amabili, M., Spertini, F., Auguste, M. B., and Bonin, G., (2009) Famous Mineral Localities: The Lac D'Amiante Mine, Back Lake, Thetford Mines, Quebec. Mineralogical Record 40(4) 297-304.
www.alpinegems.net
China
 
  • Xinjiang Autonomous Region
    • Yili Hasake Autonomous Prefecture (Ili Kazakh Autonomous Prefecture)
      • Tacheng Prefecture (Tarbaghatay Prefecture)
        • Tuoli Co. (Toli Co.)
          • Sartohay (Sartokay; Sartuohai; Saertuohai)
Yanling Tang (2005): Non-metallic deposits of Xinjiang, China [Zhongguo Xinjiang Fei Jinshu Kuangchuang]. Geological Publishing House (Beijing), 289 pp.
France
 
  • Auvergne-Rhône-Alpes
    • Isère
      • Vizille
        • Chamrousse
Demargne M. (2014) : L'andradite demantoïde de Chamrousse, isère. Le règne minéral N° 114, pp 21-27
Germany
 
  • Bavaria
    • Franconia
      • Münchberg Metamorphic complex
        • Oberkotzau
          • Wurlitz
F. Müller: "Bayerns steinreiche Ecke", 2nd ed., Oberfränkische Verlagsanstalt (Hof), 1984
        • Zell
F. Müller: "Bayerns steinreiche Ecke", 2nd ed., Oberfränkische Verlagsanstalt (Hof), 1984
  • Hesse
    • Dillenburg District
      • Hirzenhain
S. Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
Iran
 
  • Kerman Province
    • Baft County
Gems and Gemology, Volume 38, Issue 1
  • West Azarbaijan Province (West Azerbaijan Province)
    • Takab (Takan Tepe)
Vachik Hairapetian Collection
Italy
 
  • Aosta Valley
    • Ayas Valley
      • Ayas
        • Champoluc
De Michele, V. (1972) Il Monte Rosso di Verra (Ayas, Aosta). Notizie del Gruppo Mineralogico Lombardo, 3, 4 (dicembre 1972), 83-85.
Brugnatelli, L. (1903): Idromagnesite e artinite di Emarèse (Valle d'Aosta). Rend. R. Ist. Lombardo di Sci. e Lett., serie 2, 36, 824-828; Grill, E. (1922): Sui giacimenti d'amianto delle Alpi piemontesi. Atti Soc. Ital. Sci. Nat., 60, 3-4, 287-301; Del Caldo, A., Moro, C., Gramaccioli, C.M., Boscardin, M. (1973): Guida ai minerali. Fratelli Fabbri Editori, Milano, 208 pp.; Castello, P. (1974): Il giacimento di amianto di Emarèse. Bull. Soc. Flore Valdôtaine, 28, 63-67; Gramaccioli, C.M. (1975): Minerali alpini e prealpini. Istituto Italiano Edizioni Atlas, Bergamo, 2 vol., 472 pp.; Castello, P. (1981): Il giacimento di amianto di Emarèse (AO). Riv. Mineral. Ital., 5, 3 (3-1981), 86-90.
Grill, E. (1922): Sui giacimenti d'amianto delle Alpi piemontesi. Atti Soc. Ital. Sci. Nat., 60, III-IV, 287-301; Del Caldo, A., Moro, C., Gramaccioli, C.M., Boscardin, M. (1973): Guida ai minerali. Fratelli Fabbri Editori, Milano, 208 pp.; Castello, P. (1974): Il giacimento di amianto di Emarèse. Bull. Soc. Flore Valdôtaine, 28, 63-67; Gramaccioli, C.M. (1975): Minerali alpini e prealpini. Istituto Italiano Edizioni Atlas, Bergamo, 2 vol., 472 pp.; Castello, P. (1981): Il giacimento di amianto di Emarèse (AO). Riv. Mineral. Ital., 5, 3 (3-1981), 86-90.
    • Montjovet
Matteo Chinellato collection
C.M. Gramaccioli (1975)-Minerali alpini e Prealpini-Edizioni Atlas Bergamo
  • Lombardy
    • Sondrio Province
      • Valtellina
No reference listed
          • Lanterna Valley
            • Lanzada
Bedognè, F., Montrasio, A., Sciesa, E. (1993) I minerali della provincia di Sondrio: Valmalenco. Bettini, Sondrio, 275 pp. Domenico Preite Collection & Photo
              • Campo Franscia (Franscia)
De Michele, V. (1974). Guida mineralogica d'Italia. Istituto Geografico De Agostini, Novara, 2 vol.
              • Scerscen Valley
Tabacchi, C. (1972) Le cave di amianto abbandonate in località Vallone di Scerscen (Val Malenco, Sondrio). Notizie Gr. Mineral. Lomb., 4, 88-89.
Gramaccioli, C.M. (1962) I minerali valtellinesi nella raccolta di Pietro Sigismund. Ed. privata, Milano, 179 pp. Bedognè, F. (1970) Località di ritrovamento dei demantoidi. In: Boscardin, M., De Michele, V., Scaini, G. Itinerari mineralogici della Lombardia. Ed. Museo Civ. St. Nat. e Soc. It. Sci. Nat., Milano, 86-88. Bedognè, F., Montrasio, A., Sciesa, E. (1993) I minerali della provincia di Sondrio: Valmalenco. Bettini, Sondrio, 275 pp.
Bedognè, F., Montrasio, A., Sciesa, E. (1993) I minerali della provincia di Sondrio: Valmalenco. Bettini, Sondrio, 275 pp.
De Michele, V. (1974). Guida mineralogica d'Italia. Istituto Geografico De Agostini, Novara, 2 vol. ; Giovanni Scapin specimen
  • Piedmont
    • Torino Province
      • Lanzo Valleys
        • Ala Valley
          • Balme
            • Mussa Alp (Pian della Mussa; Piano della Mussa; La Mussa; Lamussa)
Gramaccioli, C.M. (1975). Minerali alpini e prealpini. Istituto Italiano Edizioni Atlas, Bergamo, 2 vol.
  • Tuscany
    • Livorno Province
      • Livorno
        • Poggio Corbolone
Sammartino F., 2009, Minerali miniere e cave dei Monti Livornesi, Comune di Livorno.
Japan
 
  • Honshu Island
    • Kanto Region
      • Saitama Prefecture
        • Chichibu City
          • Ohtaki-mura
            • Nakatsugawa
Specimens on sale at TIMA show, Tokyo, 2012.
Madagascar
 
  • Antsiranana Province
    • Diana Region (Northern Region)
      • Ambanja District
        • Antsakoamanondro Commune
Pezzotta, F. (2009). Demantoide e Topazolite: nuovo ritrovamento in Madgascar. Rivista Mineralogica Italiana, n.3-2009, 198-200; Pezzotta, F. (2010): Demantoid und Topazolith aus Antetezambato, Nordmadagaskar. Lapis, 35 (10), 31-39; 90; Hintze, J. (2010): Eine Reise zu den Demantoiden von Antetezambato. Lapis, 35 (10), 40-43 (in German).
Mexico
 
  • Veracruz
    • Mun. de Tatatila
      • Piedra Parada (Piedras Parado)
Mineralogical Record Special Issue III, Nov.-Dec. 2003, Volume 34, No. 6 http://www.gia.edu/gems-gemology/winter-2015-gemnews-mexican-demantoid-new-deposits
Namibia
 
  • Erongo Region
    • Dâures
Von Bezing, L., Bode, R., and Jahn, S., (2008) Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern, pp 451 (in English).
Von Bezing, L., Bode, R., and Jahn, S., (2008) Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern, 451 pp (in English).
Rob Lavinsky
Locker, H. (2011): Mineraliensammeln im Urlaub: Grün ist die Hoffung: Auf der Suche nach Demantoiden in Namibia. Lapis 36 (12): 26-29
Manfred Lehrl (pers. comm. to U. Kolitsch, 2011)
    • Karibib
Bezing, L. von, Bode, R. & Jahn, S. (2007): Namibia. Mineralien und Fundstellen. Edition Schloss Freudenstein, Bode Verlag, Haltern, 856 pp. (in German)
Bezing, L. von, Bode, R. & Jahn, S. (2007): Namibia. Mineralien und Fundstellen. Edition Schloss Freudenstein, Bode Verlag, Haltern, 856 pp. (in German)
      • Usakos
Min Rec 29:140
    • Omaruru
Von Bezing, L., Bode, R., and Jahn, S., (2008) Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern, 451 pp (in English).
Pakistan
 
  • Balochistan (Baluchistan)
José Zendrera collection
Russia
 
  • Chukotka Autonomous Okrug
    • Koryakskoe plateau
http://geo.web.ru/druza/l-Tamvatnei.htm; http://www.pegmatite.ru/
  • Murmansk Oblast
    • Kovdor Massif
[World of Stones 95:5-6, p64]
  • Sverdlovsk Oblast
    • Ekaterinburg (Sverdlovsk)
Sehrig, M. (2008): Lapis 33 (11), 32-35.
    • Nizhnii Tagil
Handbook of Mineralogy
      • Kamennaya Telyana
No reference listed
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast
        • Verkhnii Ufalei
          • Ufaley District (Ufalei District)
            • Korkodin
[MinRec 32:42]
Slovakia
 
  • Košice Region
    • Rožňava Co.
Duda, Rejl, Slivka: "Mineralien", 1991
Spain
 
  • Extremadura
    • Badajoz
      • Burguillos del Cerro
  • Galicia
    • A Coruña (La Coruña)
Madon, M., Gil, J.I., Via, J. and Girardeau, J. (1991). Characterization and thermodynamic properties of andradite, Ca3Fe2Si3O12. American Mineralogist, 76:1249-1260. Calvo, Miguel. (2018). Minerales y Minas de España. Vol. IX. Silicatos. Escuela Técnica Superior de Ingenieros de Minas de Madrid. Fundación Gómez Pardo. 767 págs.
Sri Lanka
 
  • Sabaragamuwa Province
    • Ratnapura District
      • Ratnapura
Ceylon Aluvial Mine, (Book, Co. 2002)
Switzerland
 
  • Grischun (Grisons; Graubünden)
    • Poschiavo Valley
      • Poschiavo (Puschlav)
        • Selva
Romani E. (2000): Andar per cristalli - Tesori nascosti. Centro studi del Museo mineralogico naturalistico di Bormio, 151 p.
  • Wallis (Valais)
    • Binn Valley
      • Geisspfad area
found by FdW
    • Zermatt - Saas Fee area
      • Matt Valley
        • Zermatt
          • Findel glacier (Findeln glacier; Findelen glacier) area
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Verlag Wepf & Co. (Basel), p. 38-39
      • Saas Valley
        • Saas-Fee
          • Fee Glacier
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Verlag Wepf & Co. (Basel), p. 38
Ref.: Stalder, H. A., de Quervain, F., Niggli, E., Graeser, St., Die Mineralfunde der Schweiz, (1973), p. 321
Tajikistan
 
  • Viloyati Mukhtori Gorno-Badakhshan (Viloyati Badakhshoni Kuni)
[MinRec 32:42]
  • Viloyati Sogd (Viloyati Sughd; Viloyati Khodzhent; Viloyati Leninabad)
    • Kuraminskii Range
      • Altyn-Topkan ore field
USA
 
  • California
    • San Benito Co.
      • Diablo Range
        • New Idria District
          • Idria (New Idria)
[www.johnbetts-fineminerals.com]
          • Santa Rita Peak
www.mineralsocal.org
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