Delessite
A variety of Chlorite Group
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About Delessite
Achille-Joseph Delesse
Formula:
(Mg,Fe,Fe,Al)(Si,Al)4O10(O,OH)8
Name:
Named by Karl Friedrich Naumann in 1850 in honor of Achille-Joseph Delesse (1817 Metz, France – March 24, 1881 Paris, France), mineralogist and geologist of the Sorbonne University and later, the École des Mines.
Fe-bearing variety of clinochlore (some references also consider it a Mg-rich variety of chamosite).
Unique Identifiers
Mindat ID:
1250 (as Delessite)
1016 (as Chlorite Group)
1016 (as Chlorite Group)
Long-form identifier:
mindat:1:1:1250:4 (as Delessite)
mindat:1:1:1016:6 (as Chlorite Group)
mindat:1:1:1016:6 (as Chlorite Group)
Similar Names
| Dallasite | A rock subtype |
| Telosite | A synonym of 'Telaginite' |
Classification of Delessite
16.19.10
16 : Silicates Containing Aluminum and other Metals
19 : Aluminosilicates of Fe and Mg
16 : Silicates Containing Aluminum and other Metals
19 : Aluminosilicates of Fe and Mg
Chemistry of Delessite
Mindat Formula:
(Mg,Fe,Fe,Al)(Si,Al)4O10(O,OH)8
Element Weights:
Synonyms of Delessite
Other Language Names for Delessite
Common Associates
Associations Based on Photo Data:
| 6 photos of Delessite associated with Quartz | SiO2 |
| 4 photos of Delessite associated with Laumontite | CaAl2Si4O12 · 4H2O |
| 3 photos of Delessite associated with Harmotome | Ba2(Si12Al4)O32 · 12H2O |
| 3 photos of Delessite associated with 'Amethyst' | SiO2 |
| 2 photos of Delessite associated with Clinochlore | Mg5Al(AlSi3O10)(OH)8 |
| 1 photo of Delessite associated with Goethite | Fe3+O(OH) |
| 1 photo of Delessite associated with Calcite | CaCO3 |
Other Information
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 Delessite
mindat.org URL:
https://www.mindat.org/min-1250.html
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Mineral Dealers:
References for Delessite
Reference List:
Localities for Delessite
Showing 57 localities.
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Antarctica | |
Australia | |
| Schreefel et al. (2025) |
Brazil | |
| Sauer (1982) | |
Bulgaria | |
| I. Kostov et al. (1964) |
China | |
| Bi Zhu et al. (2008) |
| Miao Yu et al. (2013) |
Czech Republic | |
| Vtělenský J. (1959) |
| Beran (Ag, Au, Co) +2 other references |
| Ulrych (2000) |
| Dolníček et al. (2024) |
| Houzar +5 other references |
Germany | |
| Weiß (1990) |
| Weiß (1990) |
| Bartnik (2006) |
| Thomas Lühr Collection |
Madagascar | |
| Lacroix (1922) |
New Zealand | |
| Railton et al. (1990) |
| Railton et al. (1990) |
| Railton et al. (1990) |
| Railton et al. (1990) |
Norway | |
| Neumann (1955) |
Panama | |
| BMNH specimen #BM.1985 |
Poland | |
| Traube (1888) |
| Lis et al. (1986) |
| Lis et al. (1986) |
| Breslau +1 other reference | |
| Kühn B. (1918) |
| Lis et al. (1986) |
| Krzysztof Andrzejewski | |
Russia | |
| Silyanov et al. (2021) |
| Soloviev et al. (2011) |
Slovakia | |
| Koděra et al. (1986) |
| Koděra et al. (1986) | |
| Koděra et al. (1986) | |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
| Koděra et al. (1986) |
South Korea | |
| Kinosaki (1941) |
Sweden | |
| |
| Valentin Alain (2014) |
| |
UK | |
| [Specimen in the Natural History Museum |
USA | |
| Anthony et al. (1995) |
| Anthony et al. (1995) |
| |
| Gleba (2008) | |
| Yale Peabody Museum #5236 |
| Palache & Fraprie | |
| Gleba (2008) | |
| Heinrich et al. (2004) |
| Heinrich et al. (2004) |
| Bullock (1981) |
| Dietrich (1990) |
Fischbach, Herrstein-Rhaunen, Birkenfeld, Rhineland-Palatinate, Germany