Cerchiaraite-(Mn)
A valid IMA mineral species
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About Cerchiaraite-(Mn)
Formula:
Ba4Mn3+4(Si4O12)O2(OH)4Cl2[Si2O3(OH)4]
Colour:
Deep green
Lustre:
Vitreous
Hardness:
4 - 5
Specific Gravity:
3.62
Crystal System:
Tetragonal
Member of:
Name:
Named cerchiaraite by Basso et al. in 2000, for the type locality of Cerchiara mine, Italy. It was renamed with a suffix by Kampf et al. in 2013 following the discovery of the Fe and Al analogues. The suffix is for the dominant trivalent M cation.
Isostructural with:
The Mn analogue of cerchiaraite-(Al) and cerchiaraite-(Fe). Related to bobmeyerite and ashburtonite.
Unique Identifiers
Mindat ID:
7081
Long-form identifier:
mindat:1:1:7081:8
GUID
(UUID V4):
(UUID V4):
73751980-0f32-4220-abbf-ca1a0f1e74d6
IMA Classification of Cerchiaraite-(Mn)
Approved
First published:
2000
Classification of Cerchiaraite-(Mn)
9.CF.25
9 : SILICATES (Germanates)
C : Cyclosilicates
F : [Si4O12]8- 4-membered single rings, with insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
F : [Si4O12]8- 4-membered single rings, with insular complex anions
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 |
---|---|---|
Ccr-Mn | 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 Cerchiaraite-(Mn)
Vitreous
Transparency:
Transparent
Colour:
Deep green
Streak:
Pale green
Hardness:
4 - 5 on Mohs scale
Hardness:
VHN50=296 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
None
None
Fracture:
Irregular/Uneven
Density:
3.62 g/cm3 (Measured) 3.70 g/cm3 (Calculated)
Optical Data of Cerchiaraite-(Mn)
Type:
Uniaxial (+)
RI values:
nω = 1.745(5) nε = 1.765(5)
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Chemistry of Cerchiaraite-(Mn)
Mindat Formula:
Ba4Mn3+4(Si4O12)O2(OH)4Cl2[Si2O3(OH)4]
Crystallography of Cerchiaraite-(Mn)
Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I4/mmm
Setting:
I4/mmm
Cell Parameters:
a = 14.223(16) Å, c = 6.141(4) Å
Ratio:
a:c = 1 : 0.432
Unit Cell V:
1,242.29 ų (Calculated from Unit Cell)
Z:
2
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0014905 | Cerchiaraite-(Mn) | Basso R, Lucchetti G, Zefiro L, Palenzona A (2000) Cerchiaraite, a new natural Ba-Mn-mixed-anion silicate chloride from the Cerchiara mine, northern Apennines, Italy Neues Jahrbuch fur Mineralogie, Monatshefte 2000 373-384 | 2000 | Cerchiara mine, Va di Vara, northern Apennines, Italy | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
10.15 Å | (88) |
4.417 Å | (49) |
3.319 Å | (75) |
3.01 Å | (100) |
2.619 Å | (74) |
2.577 Å | (62) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) |
Type Occurrence of Cerchiaraite-(Mn)
General Appearance of Type Material:
grains and radial aggregates
Place of Conservation of Type Material:
Dipartimento per Studio del Territorio e delle sue Risorse, Università di Genova, Italy.
Associated Minerals at Type Locality:
Reference:
Basso, R., Lucchetti, G., Zefiro, L., Palenzona, A. (2000) Cerchiaraite, a new natural Ba-Mn-mixed-anion silicate chloride from the Cerchiara mine, northern Apennines, Italy. Neues Jahrbuch für Mineralogie, Monatshefte: 373-384.
Synonyms of Cerchiaraite-(Mn)
Other Language Names for Cerchiaraite-(Mn)
Relationship of Cerchiaraite-(Mn) to other Species
Member of:
Other Members of this group:
Cerchiaraite-(Al) | Ba4Al4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl | Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm |
Cerchiaraite-(Fe) | Ba4Fe3+4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl | Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm |
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
9.CF. | Bobmeyerite | Pb4(Al3Cu)(Si4O12)(S0.5Si0.5O4)(OH)7Cl(H2O)3 |
9.CF.05 | Ashburtonite | Pb4Cu4(Si4O12)(HCO3)4(OH)3Cl · H2O |
9.CF.10 | Kainosite-(Y) | Ca2(Y,Ce)2(Si4O12)(CO3) · H2O |
9.CF.15 | Clinophosinaite | Na12(Ca,Sr)4(Si4O12)(PO4)4 |
9.CF.15 | Phosinaite-(Ce) | Na13Ca2(Ce,La,Th,Nd,Pr)(Si4O12)(PO4)4 |
9.CF.20 | Strakhovite | NaBa3Mn2+2Mn3+2Si6O19(OH)3 |
9.CF.25 | Cerchiaraite-(Al) | Ba4Al4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl |
9.CF.25 | Cerchiaraite-(Fe) | Ba4Fe3+4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl |
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 Cerchiaraite-(Mn)
mindat.org URL:
https://www.mindat.org/min-7081.html
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References for Cerchiaraite-(Mn)
Reference List:
Localities for Cerchiaraite-(Mn)
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).
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.
All localities listed without proper references should be considered as questionable.
Australia | |
| Coombs et al. (2004) |
Italy (TL) | |
| Basso et al. (2000) +2 other references |
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Cerchiara Mine, Borghetto di Vara, La Spezia Province, Liguria, Italy