Arsenmedaite (original) (raw)
A valid IMA mineral species
About ArsenmedaiteHide
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Formula:
Mn2+6 As5+Si5O18(OH)
Specific Gravity:
3.772 (Calculated)
Crystal System:
Monoclinic
Name:
Named owing to this chemical relationship with medaite, which was named after Francesco Meda (20 September 1926, Turin, Italy - 13 September 1977, Turin, Italy).
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:51567:8
b2ca18c9-b196-438d-830b-f14a9ce42f2a
IMA Classification of ArsenmedaiteHide
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IMA Formula:
Mn2+6As5+Si5O18(OH)
Type description reference:
Biagioni, Cristian, Belmonte, Donato, Carbone, Cristina, Cabella, Roberto, Zaccarini, Federica, Balestra, Corrado (2019) Arsenmedaite, Mn62+As5+Si5O18OH, the arsenic analogue of medaite, from the Molinello mine, Liguria, Italy: occurrence and crystal structure. European Journal of Mineralogy, 31 (1) 117-126 doi:10.1127/ejm/2018/0030-2792
Classification of ArsenmedaiteHide
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9.BJ.
9 : SILICATES (Germanates)
B : Sorosilicates
J : Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Amed | 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 ArsenmedaiteHide
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Cleavage:
Distinct/Good
Good {100}.
Parting:
A parting normal to the elongation.
Fracture:
Irregular/Uneven
Density:
3.772 g/cm3 (Calculated)
Chemistry of ArsenmedaiteHide
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Mindat Formula:
Mn2+6 As5+Si5O18(OH)
Crystallography of ArsenmedaiteHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 6.7099(3) Å, b = 29.001(1) Å, c = 7.5668(3) Å
β = 95.469(3)°, γ = °
Ratio:
a:b:c = 0.231 : 1 : 0.261
Unit Cell V:
1,465.75 ų (Calculated from Unit Cell)
Comment:
Space group P21/n.
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.777 Å | (58) |
| 3.266 Å | (100) |
| 3.159 Å | (72) |
| 3.094 Å | (82) |
| 2.963 Å | (83) |
| 2.935 Å | (79) |
| 2.788 Å | (68) |
| 2.612 Å | (98) |
Comments:
From Type Description.
Geological EnvironmentHide
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Type Occurrence of ArsenmedaiteHide
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General Appearance of Type Material:
Prismatic crystals, up to 200 μm.
Place of Conservation of Type Material:
Type material is deposited in the mineralogical collections of the Museo di Storia Naturale, Università di Pisa, Via Roma 79, Calci (Pisa), Italy, catalogue number 19901, and the Dipartimento di Scienze della Terra, dell’Ambiente e della Vita (DISTAV), Università di Genova, Corso Europa 26, Genova, Italien, catalogue number MO483.
Geological Setting of Type Material:
In veinlets, a few mm in thickness, cutting the braunite ore bodies hosted by Jurassic metacherts.
Associated Minerals at Type Locality:
Reference:
Biagioni, C., Belmonte, D., Carbone, C., Cabella, R., Zaccarini, F., Balestra, C. (2019): Arsenmedaite, Mn2+6As5+Si5O18(OH), the arsenic analogue of medaite, from the Molinello mine, Liguria, Italy: occurrence and crystal structure. European Journal of Mineralogy, 31, 117-126.
Synonyms of ArsenmedaiteHide
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Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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| 9.BJ.05 | Orientite | Ca8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2O | Orth. m m m _(_2/_m_2/_m_2/m ) |
|---|---|---|---|
| 9.BJ.10 | Rosenhahnite | HCa3[Si3O9(OH)] | Tric. 1 : _P_1 |
| 9.BJ.15 | Trabzonite | Ca4(Si3O9)(OH)2 | Orth. m _m_2 : A m _a_2 |
| 9.BJ.20 | Thalénite-(Y) | Y3Si3O10F | Mon. |
| 9.BJ.25 | Tiragalloite | Mn2+4As5+Si3O12(OH) | Mon. 2/m |
| 9.BJ.30 | Medaite | Mn2+6V5+Si5O18(OH) | Mon. 2/m |
| 9.BJ.35 | Ruizite | Ca2Mn3+2[Si4O11(OH)2](OH)2 · 2H2O | Mon. 2 |
| 9.BJ.35 | Taniajacoite | SrCaMn3+2Si4O11(OH)4 · 2H2O | Tric. 1 |
| 9.BJ.35 | Strontioruizite | Sr2Mn3+2Si4O11(OH)4 · 2H2O | Mon. 2 : _B_2 |
| 9.BJ.40 | Ardennite-(As) | Mn2+4Al4(AlMg)(AsO4)(SiO4)2(Si3O10)(OH)6 | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 9.BJ.40 | Ardennite-(V) | Mn2+4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6 | Orth. m m m _(_2/_m_2/_m_2/m ) : P m m n |
| 9.BJ.40 | Kannanite | Ca4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6 | Orth. m m m _(_2/_m_2/_m_2/m ) : P m m n |
| 9.BJ.40 | Alpeite | Ca4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6 | Orth. m m m _(_2/_m_2/_m_2/m ) : P m m n |
| 9.BJ.45 | Kilchoanite | Ca6(SiO4)(Si3O10) | Orth. m m m _(_2/_m_2/_m_2/m ) |
| 9.BJ.50 | Kornerupine | Mg3Al6(Si,Al,B)5O21(OH) | Orth. m m m _(_2/_m_2/_m_2/m ) : C m c m |
| 9.BJ.50 | Prismatine | (◻,Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22 | Orth. m m m _(_2/_m_2/_m_2/m ) : C m c m |
| 9.BJ.55 | Zunyite | Al13Si5O20(OH,F)18Cl | Iso. 43_m_ : F_43_m |
| 9.BJ.60 | Hubeite | Ca2Mn2+Fe3+Si4O12(OH) · 2H2O | Tric. 1 : _P_1 |
| 9.BJ.65 | Cassagnaite | (Ca,Mn2+)4(Fe3+,Mn3+,Al)4(V3+,Mg,Al)2(Si3O10)(SiO4)2(OH,O)8 | Orth. m m m _(_2/_m_2/_m_2/m ) : C m c m |
| 9.BJ.70 | Pavlovskyite | Ca8(SiO4)2(Si3O10) | Orth. m m m _(_2/_m_2/_m_2/m ) : P b c n |
Other InformationHide
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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 ArsenmedaiteHide
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References for ArsenmedaiteHide
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Reference List:
Biagioni, Cristian, Belmonte, Donato, Carbone, Cristina, Cabella, Roberto, Zaccarini, Federica, Balestra, Corrado (2019) Arsenmedaite, Mn62+As5+Si5O18OH, the arsenic analogue of medaite, from the Molinello mine, Liguria, Italy: occurrence and crystal structure. European Journal of Mineralogy, 31 (1) 117-126 doi:10.1127/ejm/2018/0030-2792
Localities for ArsenmedaiteHide
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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
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- 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.
| Austria | |
|---|---|
| Salzburg Tamsweg District Tweng ⓘ Fuchs Alp - Fuchs lake area | Kolitsch et al. (2021) |
| Italy (TL) | |
| Liguria Genoa Ne ⓘ Molinello Mine (TL) | Mineralogical Magazine +2 other references |
| Statale ⓘ Scrava Mine (Statale Mine) | //doi.org/10.57635/MICRO.2023.21.7 |