Pycnochlorite
A variety of Clinochlore
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Formula:
Mg5Al(AlSi3O10)(OH)8
Used by Hey (1954) in his widely used, formal classification of chlorites, for ones with Mg/(Mg+Fe) = 0.75-0.5 and Si = 5.6-6.2 atoms per 8 tetrahedral sites, but now considered a variety of clinochlore.
Originally spelled pyknochlorite (from German Pyknochlorit).
Originally spelled pyknochlorite (from German Pyknochlorit).
Unique Identifiers
Mindat ID:
40405 (as Pycnochlorite)
1070 (as Clinochlore)
1070 (as Clinochlore)
Long-form identifier:
mindat:1:1:40405:3 (as Pycnochlorite)
mindat:1:1:1070:8 (as Clinochlore)
mindat:1:1:1070:8 (as Clinochlore)
Similar Names
| Pyknochlorit | A synonym of 'Pyknochlorite' |
Chemistry of Pycnochlorite
Mindat Formula:
Mg5Al(AlSi3O10)(OH)8
Element Weights:
Synonyms of Pycnochlorite
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 Pycnochlorite
mindat.org URL:
https://www.mindat.org/min-40405.html
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Please feel free to link to this page.
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References for Pycnochlorite
Reference List:
Localities for Pycnochlorite
Showing 36 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.
Algeria | |
| Boukaoud et al. (2021) |
Australia | |
| Hong et al. (2025) |
Canada | |
| Neyedley et al. (2017) |
| Schofield et al. (2024) |
| Schofield et al. (2024) | |
China | |
| Duan et al. (2022) |
| Yang et al. (2026) |
| Zhanshi Zhang et al. (2007) |
| Zhanshi Zhang et al. (2007) |
| Tian et al. (2025) |
| Lu et al. (2026) |
| Yushuai Yu et al. (2012) |
Cyprus | |
| Antivachis (2015) |
Egypt | |
| Abd El-Fatah et al. (2023) |
| Atef et al. (2023) | |
| Atef et al. (2023) | |
| Zoheir et al. (2018) |
| Abdelfadil et al. (2024) | |
Greece | |
| Kevrekidis et al. (2024) |
India | |
| Rout et al. (2022) +1 other reference |
Indonesia | |
| doi: 10.13140/RG.2.2.13179.41767 +1 other reference |
| Hakim (2017) | |
Iran | |
| Khoshnoodi et al. (2023) |
Mali | |
| Randgold Resources |
Morocco | |
| Tuduri et al. (2018) |
Russia | |
| Michurin et al. (2024) |
| Gramenitskiy et al. (2019) |
| Shabutdinov et al. (2024) | |
Saudi Arabia | |
| El-shafei et al. (2020) |
Spain | |
| Tornos et al. (2024) |
| Garófano-Medina et al. (2021) |
| Arias et al. (2021) |
Taiwan | |
| Zhengzhang Tao (1992) |
Ukraine | |
| Sośnicka et al. (2026) |
USA | |
| Peter G. Vikre (1998) |
Zimbabwe | |
| Anglo American plc |
