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Sbacchiite
A valid IMA mineral species
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About Sbacchiite
Formula:
Ca2AlF7
Colour:
Colorless
Lustre:
Vitreous
Specific Gravity:
3.08
Crystal System:
Orthorhombic
Name:
Named in honor of Massimo Sbacchi (b. 1958), biologist and mineral collector, for his long-time study of fumarolic minerals. Pronounced ‘sbaki-ite’.
Chemically related to carlhintzeite.
Found in a fossil fumarole from the 1944 eruption, with T=80°C.
Found in a fossil fumarole from the 1944 eruption, with T=80°C.
Unique Identifiers
Mindat ID:
52753
Long-form identifier:
mindat:1:1:52753:0
IMA Classification of Sbacchiite
Approved
Approval year:
2018
First published:
2019
Approval history:
IMA No. 2017-097
Classification of Sbacchiite
3.CB.55
3 : HALIDES
C : Complex halides
B : Neso-aluminofluorides
3 : HALIDES
C : Complex halides
B : Neso-aluminofluorides
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Scc | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Sbacchiite
Vitreous
Transparency:
Transparent, Translucent
Colour:
Colorless
Streak:
White
Tenacity:
Brittle
Cleavage:
None Observed
Density:
3.08(2) g/cm3 (Measured) 3.116 g/cm3 (Calculated)
Optical Data of Sbacchiite
Type:
Biaxial (+)
RI values:
nα = 1.379(4) nβ = 1.384(4) nγ = 1.390(4)
2V:
Measured: 83° (2), Calculated: 85.1°
Max. Birefringence:
δ = 0.011
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Chemistry of Sbacchiite
Mindat Formula:
Ca2AlF7
Element Weights:
Elements listed:
Crystallography of Sbacchiite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
Cell Parameters:
a = 7.665(2) Å, b = 6.993(1) Å, c = 9.566(2) Å
Ratio:
a:b:c = 1.096 : 1 : 1.368
Unit Cell V:
512.2 ų
Z:
4
Twinning:
No twinning observed
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.840 Å | (45) |
| 3.563 Å | (85) |
| 3.499 Å | (100) |
| 2.899 Å | (55) |
| 2.750 Å | (30) |
| 2.281 Å | (20) |
| 2.255 Å | (52) |
| 2.173 Å | (36) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3a: Earth’s earliest Hadean crust | >4.50 |
| 9 : Lava/xenolith minerals (hornfels, sanidinite facies) | |
| Stage 7: Great Oxidation Event | <2.4 |
| 45b : [Other oxidized fumarolic minerals] |
Type Occurrence of Sbacchiite
General Appearance of Type Material:
Elongated, colorless crystals up to about 60 µm in length.
Place of Conservation of Type Material:
Reference collection of the Department of Chemistry, University of Milan, Via Golgi 19, I-20133 Milano, Italy, sample no. 2017-01
Associated Minerals at Type Locality:
Synonyms of Sbacchiite
Other Language Names for Sbacchiite
Dutch:Sbacchiiet
German:Sbacchiit
Common Associates
Associations Based on Photo Data:
| 1 photo of Sbacchiite associated with Gearksutite | Ca[Al(F,OH)5(H2O)] |
Related Minerals - Strunz-mindat Grouping
| 3.CB.05 | Cryolithionite | Na3Al2(LiF4)3 |
| 3.CB.15 | Elpasolite | K2NaAlF6 |
| 3.CB.15 | Simmonsite | Na2LiAlF6 |
| 3.CB.15 | Cryolite | Na2NaAlF6 |
| 3.CB.20 | Colquiriite | CaLi[AlF6] |
| 3.CB.25 | Leonardsenite | MgAlF5 · 2H2O |
| 3.CB.25 | Weberite | Na2Mg[AlF6]F |
| 3.CB.30 | Karasugite | SrCa[Al(F,OH)7] |
| 3.CB.35 | Usovite | Ba2CaMgAl2F14 |
| 3.CB.40 | Thomsenolite | NaCa[AlF6] · H2O |
| 3.CB.40 | Pachnolite | NaCa[AlF6] · H2O |
| 3.CB.45 | Carlhintzeite | Ca2[AlF6]F · H2O |
| 3.CB.50 | Yaroslavite | Ca3Al2F10(OH)2 · H2O |
| 3.CB.60 | Verneite | Na2Ca3Al2F14 |
Fluorescence of Sbacchiite
None observed
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 Sbacchiite
mindat.org URL:
https://www.mindat.org/min-52753.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Sbacchiite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2018) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) Newsletter 41. European Journal of Mineralogy, 30. 183-186 doi:10.1127/ejm/2018/0030-2736p.184
Localities for Sbacchiite
Showing 5 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.
Italy | |
| Balassone et al. (2019) |
| Campostrini et al. (2019) |
| European Journal of Mineralogy: 30: ... +2 other references | |
| European Journal of Mineralogy: 30: ... +2 other references | |
Spain | |
| Campeny et al. (2023) |
Quick NavTopAbout SbacchiiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatFluorescence Other InformationInternet Links References Localities Locality List
Vesuvius fumaroles, Metropolitan City of Naples, Campania, Italy