Ambrinoite
A valid IMA mineral species
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About Ambrinoite
Formula:
[K,(NH4)]2(As,Sb)6(Sb,As)2S13 · H2O
Colour:
Cinnabar-red
Lustre:
Vitreous, Resinous
Specific Gravity:
3.305 (Calculated)
Crystal System:
Triclinic
Name:
After Pierluigi Ambrino (b. 1947), a mineral collector, specializing in Piedmont and manganese deposits, who kindly provided the specimen studied.
Compare gerstleyite and gillulyite (homeotypic). Unique combination of elements: ambrinoite is the only currently known potassium thioarsenite (and thioantimonite); this is also the only known sulphide/sulphosalt containing important amounts of ammonium.
Unique Identifiers
Mindat ID:
39789
Long-form identifier:
mindat:1:1:39789:6
GUID
(UUID V4):
(UUID V4):
c5cd79ee-c20d-45b7-8383-6beb94d3d6dd
IMA Classification of Ambrinoite
Approved
Approval year:
2009
First published:
2011
Type description reference:
Biagioni, C., Bonaccorsi, E., Pasero, M., Moelo, Y., Ciriotti, M. E., Bersani, D., Callegari, A. M., Boiocchi, M. (2011) Ambrinoite, (K,NH4)2(As,Sb)8S13·H2O, a new mineral from Upper Susa Valley, Piedmont, Italy: The first natural (K,NH4)-hydrated sulfosalt. American Mineralogist, 96 (5) 878-887 doi:10.2138/am.2011.3723
Classification of Ambrinoite
2.HE.10
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
E : With alkalies, H2O
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
H : Sulfosalts of SnS archetype
E : With alkalies, H2O
3.8.8.2
3 : SULFOSALTS
8 : 1 < ø < 2
3 : SULFOSALTS
8 : 1 < ø < 2
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 |
|---|---|---|
| Amb | 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 Ambrinoite
Vitreous, Resinous
Transparency:
Transparent
Colour:
Cinnabar-red
Streak:
Red
Hardness Data:
Could not be measured
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {001} and {010}; poor on {100}.
Perfect on {001} and {010}; poor on {100}.
Parting:
Not observed
Fracture:
Splintery
Density:
3.305 g/cm3 (Calculated)
Comment:
Could not be measured due to lack of material.
Chemistry of Ambrinoite
Mindat Formula:
[K,(NH4)]2(As,Sb)6(Sb,As)2S13 · H2O
Crystallography of Ambrinoite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 9.704(1) Å, b = 11.579(1) Å, c = 12.102(1) Å
α = 112.82(1)°, β = 103.44(1)°, γ = 90.40(1)°
α = 112.82(1)°, β = 103.44(1)°, γ = 90.40(1)°
Ratio:
a:b:c = 0.838 : 1 : 1.045
Unit Cell V:
1211.6 ų
Z:
2
Morphology:
Masses and groups of lamellae, elongated on [100] and flattened on (001).
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.78 Å | (100) |
| 5.79 Å | (55) |
| 5.39 Å | (32) |
| 5.31 Å | (34) |
| 4.23 Å | (35) |
| 3.747 Å | (31) |
| 3.157 Å | (30) |
| 2.876 Å | (30) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-𝑇 alteration and/or metamorphism | |
| 33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 53 : Other minerals with taphonomic origins | <0.4 |
Type Occurrence of Ambrinoite
General Appearance of Type Material:
Aggregates of tabular crystals up to 1 mm in length.
Place of Conservation of Type Material:
Natural History Museum, University of Pisa, Italy (19500).
The Natural Science Museum, Turin, Italy (M/15824).
The Natural Science Museum, Turin, Italy (M/15824).
Geological Setting of Type Material:
Evaporite deposit.
Associated Minerals at Type Locality:
Reference:
Biagioni, C., Bonaccorsi, E., Pasero, M., Moëlo, Y., Ciriotti, M.E., Bersani, D., Callegari, A.M., Boiocchi, M. (2011): Ambrinoite, (K,NH4)2(As,Sb)8S13·H2O, a new mineral from Upper Susa Valley, Piedmont, Italy: the first natural (K,NH4)-hydrated sulfosalt. American Mineralogist, 96, 878-887.
Synonyms of Ambrinoite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 2.HE.05 | Gerstleyite | Na2(Sb,As)8S13 · 2H2O |
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 Ambrinoite
mindat.org URL:
https://www.mindat.org/min-39789.html
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Please feel free to link to this page.
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References for Ambrinoite
Reference List:
Biagioni, C., Bonaccorsi, E., Pasero, M., Moelo, Y., Ciriotti, M. E., Bersani, D., Callegari, A. M., Boiocchi, M. (2011) Ambrinoite, (K,NH4)2(As,Sb)8S13·H2O, a new mineral from Upper Susa Valley, Piedmont, Italy: The first natural (K,NH4)-hydrated sulfosalt. American Mineralogist, 96 (5) 878-887 doi:10.2138/am.2011.3723
Biagioni, C., Bonaccorsi, E., Pasero, M., Moelo, Y., Ciriotti, M. E., Bersani, D., Callegari, A. M., Boiocchi, M. (2011) Ambrinoite, (K,NH4)2(As,Sb)8S13·H2O, a new mineral from Upper Susa Valley, Piedmont, Italy: The first natural (K,NH4)-hydrated sulfosalt. American Mineralogist, 96 (5) 878-887 doi:10.2138/am.2011.3723
Localities for Ambrinoite
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.
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Signols Quarries, Signols, Oulx, Metropolitan City of Turin, Piedmont, Italy