Scorticoite
A valid IMA mineral species - pending publication
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Formula:
Mn6(Sb,◻)Σ2(SiO4)2O3(OH)3
Colour:
Dark red to black
Lustre:
Vitreous
Hardness:
3½ - 4
Specific Gravity:
4.416 (Calculated)
Crystal System:
Trigonal
Member of:
Name:
Named after the Scortico mine, Italy, the type locality.
Unique Identifiers
Mindat ID:
53560
Long-form identifier:
mindat:1:1:53560:9
IMA Classification of Scorticoite
Approved, Pending publication
IMA Formula:
Mn6(Sb◻)(SiO4)2O3(OH)3
Approval year:
2019
Type description reference:
Biagioni, Cristian; Bonaccorsi, Elena; Musetti, Silvia; Kampf, Anthony R.; Zaccarini, Federica; Hålenius, Ulf; Bosi, Ferdinando; Sejkora, Jiří; Dolníček, Zdeněk (2026) Scorticoite, Mn2+6(Sb5+□)Σ2(SiO4)2O3(OH)3, a new welinite-group mineral, and associated welinite from the Scortico-Ravazzone Mn ore deposit (Apuan Alps, Tuscany, Italy). Mineralogical Magazine, 1-27 doi:10.1180/mgm.2026.10194
Classification of Scorticoite
9.AF.75
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
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 |
|---|---|---|
| Srt | 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 Scorticoite
Vitreous
Colour:
Dark red to black
Streak:
Reddish brown
Hardness:
3½ - 4 on Mohs scale
Comment:
In accord with related minerals belonging to the welinite group
Tenacity:
Brittle
Fracture:
Conchoidal
Density:
4.416 g/cm3 (Calculated)
Optical Data of Scorticoite
Anisotropism:
very weak polarizing color in shades of grey
Bireflectance:
weak
Reflectivity:
| Wavelength | R1 (%) | R2 (%) |
|---|---|---|
| 470nm | 8.1% | 8.7% |
| 546nm | 7.3% | 7.9% |
| 589nm | 7.2% | 7.7% |
| 650nm | 6.9% | 7.0% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 8.7%.
R1 shown in black, R2 shown in red
Colour in reflected light:
grey
Internal Reflections:
Dark orange-red
Pleochroism:
Non-pleochroic
Chemistry of Scorticoite
Mindat Formula:
Mn6(Sb,◻)Σ2(SiO4)2O3(OH)3
Crystallography of Scorticoite
Crystal System:
Trigonal
Class (H-M):
3 - Pyramidal
Space Group:
P3
Cell Parameters:
a = 8.205(1) Å, c = 4.774(1) Å
Ratio:
a:c = 1 : 0.582
Unit Cell V:
278.34 ų (Calculated from Unit Cell)
Z:
1
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.105 Å | (s) |
| 2.858 Å | (s) |
| 2.676 Å | (ms) |
| 2.332 Å | (ms) |
| 1.787 Å | (s) |
| 1.685 Å | (m) |
| 1.552 Å | (m) |
Comments:
From Type Description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits |
Type Occurrence of Scorticoite
General Appearance of Type Material:
Crystals less than 0.1 mm.
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 19908.
Geological Setting of Type Material:
Scorticoite is likely formed by the circulation of late-stage hydrothermal fluids within the Mn-rich silicate-bearing rocks forming the Scortico-Ravazzone Mn mineralization
Associated Minerals at Type Locality:
Reference:
Biagioni, Cristian; Bonaccorsi, Elena; Musetti, Silvia; Kampf, Anthony R.; Zaccarini, Federica; Hålenius, Ulf; Bosi, Ferdinando; Sejkora, Jiří; Dolníček, Zdeněk (2026) Scorticoite, Mn2+6(Sb5+□)Σ2(SiO4)2O3(OH)3, a new welinite-group mineral, and associated welinite from the Scortico-Ravazzone Mn ore deposit (Apuan Alps, Tuscany, Italy). Mineralogical Magazine, 1-27 doi:10.1180/mgm.2026.10194
Synonyms of Scorticoite
Other Language Names for Scorticoite
Dutch:Scorticoiet
German:Scorticoit
Relationship of Scorticoite to other Species
Member of:
Other Members of Welinite Group:
| Barwoodite | Mn2+6Nb5+(SiO4)2O3(OH)3 | Trig. 3 : P3 |
| Franciscanite | Mn2+6(V5+,◻)2(SiO4)2(O,OH)6 | Trig. 3 : P3 |
| Örebroite | Mn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3 | Trig. 3 : P3 |
| Welinite | Mn2+6(W6+,Mg)2(SiO4)2(O,OH)6 | Trig. 3 : P3 |
Related Minerals - Strunz-mindat Grouping
| 9.AF. | Chegemite | Ca7(SiO4)3(OH)2 |
| 9.AF. | Jingwenite-(Y) | YAlV4+(SiO4)O2(OH)2 |
| 9.AF. | Barwoodite | Mn2+6Nb5+(SiO4)2O3(OH)3 |
| 9.AF.05 | Sillimanite | Al2(SiO4)O |
| 9.AF.05 | Xenolite | Al10Si8O31 |
| 9.AF.10 | Kanonaite | Mn3+Al(SiO4)O |
| 9.AF.10 | Andalusite | Al2(SiO4)O |
| 9.AF.15 | Kyanite | Al2(SiO4)O |
| 9.AF.20 | Krieselite | Al2(GeO4)F2 |
| 9.AF.20 | Mullite | Al4+2xSi2-2xO10-x |
| 9.AF.23 | Boromullite | Al9BSi2O19 |
| 9.AF.25 | Yoderite | Mg(Al,Fe3+)3(SiO4)2O(OH) |
| 9.AF.30 | Zincostaurolite | Zn2Al9Si4O23(OH) |
| 9.AF.30 | Staurolite | Fe2+2Al9Si4O23(OH) |
| 9.AF.30 | Magnesiostaurolite | Mg(Mg,Li)3(Al,Mg)18Si8O44(OH)4 |
| 9.AF.35 | Topaz | Al2(SiO4)(F,OH)2 |
| 9.AF.40 | Norbergite | Mg3(SiO4)F2 |
| 9.AF.45 | Chondrodite | Mg5(SiO4)2F2 |
| 9.AF.45 | Kumtyubeite | Ca5(SiO4)2F2 |
| 9.AF.45 | Reinhardbraunsite | Ca5(SiO4)2(OH,F)2 |
| 9.AF.45 | Hydroxylchondrodite | Mg5(SiO4)2(OH)2 |
| 9.AF.45 | Alleghanyite | Mn2+5(SiO4)2(OH)2 |
| 9.AF.50 | Unnamed (Ca-analogue of Humite) | Ca7(SiO4)4F2 |
| 9.AF.50 | Humite | Mg7(SiO4)3F2 |
| 9.AF.50 | Manganhumite | (Mn2+,Mg)7(SiO4)3(OH)2 |
| 9.AF.50 | Unnamed (OH-analogue of humite) | Mg7(SiO4)3(OH)2 |
| 9.AF.50 | Fluorchegemite | Ca7(SiO4)3F2 |
| 9.AF.55 | Hydroxylclinohumite | Mg9(SiO4)4(OH)2 |
| 9.AF.55 | Clinohumite | Mg9(SiO4)4F2 |
| 9.AF.55 | Sonolite | Mn2+9(SiO4)4(OH)2 |
| 9.AF.60 | Leucophoenicite | Mn2+7(SiO4)3(OH)2 |
| 9.AF.65 | Ribbeite | Mn2+5(SiO4)2(OH)2 |
| 9.AF.70 | Jerrygibbsite | Mn2+9(SiO4)4(OH)2 |
| 9.AF.75 | Franciscanite | Mn2+6(V5+,◻)2(SiO4)2(O,OH)6 |
| 9.AF.75 | Welinite | Mn2+6(W6+,Mg)2(SiO4)2(O,OH)6 |
| 9.AF.75 | Örebroite | Mn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3 |
| 9.AF.80 | Ellenbergerite | Mg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10 |
| 9.AF.85 | Magnesiochloritoid | MgAl2O(SiO4)(OH)2 |
| 9.AF.85 | Ottrélite | Mn2+Al2O(SiO4)(OH)2 |
| 9.AF.85 | Chloritoid | Fe2+Al2O(SiO4)(OH)2 |
| 9.AF.90 | Olmiite | CaMn2+[SiO3(OH)](OH) |
| 9.AF.90 | Poldervaartite | CaCa[SiO3(OH)](OH) |
| 9.AF.95 | Pilawite-(Y) | Ca2Y2Al4(SiO4)4O2(OH)2 |
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 Scorticoite
mindat.org URL:
https://www.mindat.org/min-53560.html
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References for Scorticoite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Mills, Stuart J. (2019) New minerals and nomenclature modifications approved in 2019. CNMNC Newsletter 49. Mineralogical Magazine, 83 (3) 479-483 doi:10.1180/mgm.2019.35
Biagioni, Cristian; Bonaccorsi, Elena; Musetti, Silvia; Kampf, Anthony R.; Zaccarini, Federica; Hålenius, Ulf; Bosi, Ferdinando; Sejkora, Jiří; Dolníček, Zdeněk (2026) Scorticoite, Mn2+6(Sb5+□)Σ2(SiO4)2O3(OH)3, a new welinite-group mineral, and associated welinite from the Scortico-Ravazzone Mn ore deposit (Apuan Alps, Tuscany, Italy). Mineralogical Magazine, 1-27 doi:10.1180/mgm.2026.10194
Localities for Scorticoite
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 (TL) | |
| Miyawaki et al. (2019) +2 other references |
