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Leguernite

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Formula:
Bi38O42(SO4)15
Colour:
colorless, white
Lustre:
Sub-Adamantine
Specific Gravity:
7.375 (Calculated)
Crystal System:
Monoclinic
Name:
Honours Francois Le Guern (1942-2011), better known as ‘‘Fanfan’’. With a large number of publications under his belt, Fanfan Le Guern was a very active volcanologist, and an expert on volcanic gases and sublimates.
This page provides mineralogical data about Leguernite.


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Classification of LeguerniteHide

Approved
Approval Year:
2013

Physical Properties of LeguerniteHide

Sub-Adamantine
Colour:
colorless, white
Streak:
white
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
None observed
Density:
7.375 g/cm3 (Calculated)

Chemical Properties of LeguerniteHide

Formula:
Bi38O42(SO4)15
IMA Formula:
Bi12.67O14(SO4)5

Crystallography of LeguerniteHide

Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P2
Setting:
P2
Cell Parameters:
a = 11.2486(11) Å, b = 5.6568(6) Å, c = 11.9139(10) Å
β = 99.177(7)°
Ratio:
a:b:c = 1.989 : 1 : 2.106
Unit Cell V:
748.39 ų (Calculated from Unit Cell)
Z:
1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
5.040(15)
3.220(100)
3.100(95)
2.931(25)
2.830(30)
2.502(25)
2.035(20)
1.875(20)
Comments:
From Type Description. The 3.220 Å peak coincides with a strong peak of anglesite (d = 3.223 Å).

Type Occurrence of LeguerniteHide

General Appearance of Type Material:
needle-shaped crystals up to 0.4 mm long and 0.01 mm across, which form fibrous aggregates
Place of Conservation of Type Material:
Type material is deposited in the collections of the C.L. Garavelli Museum in the Dipartimento di Scienze della Terra e Geoambientali, Universita` degli Studi di Bari ‘‘Aldo Moro’’, Italy, sample number 18/nm-V28
Geological Setting of Type Material:
walls of the high-temperature fumarole FF (T = 600ºC, direct measurement)
Associated Minerals at Type Locality:

Synonyms of LeguerniteHide

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.

References for LeguerniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Garavelli, A., Pinto, D., Bindi, L. and Mitolo, D. (2013) Leguernite, IMA 2013- 051. CNMNC Newsletter No. 17, October 2013, page 3002; Mineralogical Magazine, 77, 2997-3005.
Garavelli, A., Pinto, D., Mitolo, D., & Bindi, L. (2014): Leguernite, Bi12.67O14(SO4)5, a new Bi oxysulfate from the fumarole deposit of La Fossa crater, Vulcano, Aeolian Islands, Italy. Mineralogical Magazine, 78, 1629-1645.

Internet Links for LeguerniteHide

Localities for LeguerniteHide

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.
Italy (TL)
 
  • Sicily
    • Messina Province
      • Eolie Islands (Aeolian Islands)
        • Lipari
          • Vulcano Island
Garavelli, A., Pinto, D., Bindi, L. and Mitolo, D. (2013) Leguernite, IMA 2013- 051. CNMNC Newsletter No. 17, October 2013, page 3002; Mineralogical Magazine, 77, 2997-3005.
Mineral and/or Locality  
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