Lussatite
A variety of Opal
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About Lussatite
Formula:
SiO2 · nH2O
Name:
Named by Ernest Mallard in 1890 for a chalcedony-like material with unique properties from Lussat, near Pont-du-Chateau, Puy-de-Dome. Associated with opal and quartz.
A variety of Opal-CT
A variety of opal-CT, optically fibrous, probably with poorly crystalline orthorhombic tridymite, found in hydrothermal deposits (Fröhlich, 2020).
"A form of silica, similar in structure to chalcedony, but having a low specific gravity, G = 2.04, near that of opal; refractive index (for D) 1.446 like opal, but crystalline and optically positive." (Mallard, 1890).
A variety of opal-CT, optically fibrous, probably with poorly crystalline orthorhombic tridymite, found in hydrothermal deposits (Fröhlich, 2020).
"A form of silica, similar in structure to chalcedony, but having a low specific gravity, G = 2.04, near that of opal; refractive index (for D) 1.446 like opal, but crystalline and optically positive." (Mallard, 1890).
Unique Identifiers
Mindat ID:
5162 (as Lussatite)
3004 (as Opal)
3004 (as Opal)
Long-form identifier:
mindat:1:1:5162:6 (as Lussatite)
mindat:1:1:3004:1 (as Opal)
mindat:1:1:3004:1 (as Opal)
GUID
(UUID V4):
(UUID V4):
81b0fef5-d0fa-4a5e-bfb1-29e1ae0175f6 (as Lussatite)
b3226449-9ed0-47fe-a88a-e53851c6d480 (as Opal)
b3226449-9ed0-47fe-a88a-e53851c6d480 (as Opal)
Chemistry of Lussatite
Mindat Formula:
SiO2 · nH2O
Elements listed:
Common Associates
Associated Minerals Based on Photo Data:
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 Lussatite
mindat.org URL:
https://www.mindat.org/min-5162.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Lussatite
Localities for Lussatite
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).
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.
All localities listed without proper references should be considered as questionable.
New Zealand | |
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Lussat, Riom, Puy-de-Dôme, Auvergne-Rhône-Alpes, France