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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:
65 photos of Demantoid associated with Amphibole SupergroupAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
32 photos of Demantoid associated with QuartzSiO2
24 photos of Demantoid associated with Asbestos
19 photos of Demantoid associated with ChrysotileMg3(Si2O5)(OH)4
7 photos of Demantoid associated with TopazoliteCa3Fe3+2(SiO4)3
6 photos of Demantoid associated with AndraditeCa3Fe3+2(SiO4)3
5 photos of Demantoid associated with Stilbite subgroup
3 photos of Demantoid associated with Garnet GroupX3Z2(SiO4)3
3 photos of Demantoid associated with SepioliteMg4(Si6O15)(OH)2 · 6H2O
3 photos of Demantoid associated with UvaroviteCa3Cr2(SiO4)3

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

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 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 Province
    • Malargüe Department
      • Morro de Yeso
Dr. Jorge Dascal and Gunnar Färber specimens
Asia
 
[MinRec 32:42]
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
    • 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.
DR Congo
 
Gübelin, E. and Wolgensinger, M. (1976) Edelstenen. Uitgeverij Artis, Brussel (in Dutch).
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
    • Upper Franconia
      • Hof
        • Oberkotzau
          • Wurlitz
F. Müller: "Bayerns steinreiche Ecke", 2nd ed., Oberfränkische Verlagsanstalt (Hof), 1984
        • Zell im Fichtelgebirge
F. Müller: "Bayerns steinreiche Ecke", 2nd ed., Oberfränkische Verlagsanstalt (Hof), 1984
  • Hesse
    • Wetteraukreis
      • Hirzenhain
S. Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
Iran
 
  • Kerman
    • Baft County
Gems and Gemology, Volume 38, Issue 1
  • West Azerbaijan
    • Takab (Takan Tepe)
Vachik Hairapetian Collection
Italy
 
  • Aosta 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
    • Metropolitan City of Turin
      • 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 (Leghorn)
        • Poggio Corbolone
Sammartino F., 2009, Minerali miniere e cave dei Monti Livornesi, Comune di Livorno.
Japan
 
  • Saitama
    • Chichibu City
      • Ohtaki-mura
        • Nakatsugawa
Specimens on sale at TIMA show, Tokyo, 2012.
Madagascar
 
  • Diana
    • Ambanja
      • Antsakoamanondro
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
 
  • Sonora
GIA 2019
  • Veracruz
    • Tatatila Municipality
      • Piedra Parada
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
José Zendrera collection
Russia
 
  • Chelyabinsk Oblast
    • Verkhny Ufaley
      • Ufaley District (Ufalei District)
        • Korkodin
[MinRec 32:42]
  • 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
    • Nizhnetagilskiy District
Handbook of Mineralogy
    • Nizhnii Tagil
      • Kamennaya Telyana
No reference listed
    • Yekaterinburg
Sehrig, M. (2008): Lapis 33 (11), 32-35.
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
 
  • Grisons
    • Poschiavo Valley
      • Poschiavo (Puschlav)
        • Selva
Romani E. (2000): Andar per cristalli - Tesori nascosti. Centro studi del Museo mineralogico naturalistico di Bormio, 151 p.
  • 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
 
  • Sughd
    • Kuraminskii Range
      • Altyn-Topkan ore field
USA
 
  • California
    • San Benito Co.
      • New Idria Mining District
        • Idria (New Idria)
[www.johnbetts-fineminerals.com]
        • Santa Rita Peak
www.mineralsocal.org
 
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