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Cerchiaraite-(Mn)

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Formula:
Ba4Mn4Si6(O,OH,Cl)26
System:
Tetragonal
Colour:
Deep green
Lustre:
Vitreous
Hardness:
4 - 5
Name:
From the type locality (originally named cerchiaraite) and subsequently for the dominant trivalent M cation.
Closely related to bobmeyerite and ashburtonite.

Classification of Cerchiaraite-(Mn)

Approved
9.CF.25

9 : SILICATES (Germanates)
C : Cyclosilicates
F : [Si4O12]8- 4-membered single rings, with insular complex anions
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First Recorded Occurrence of Cerchiaraite-(Mn)

Physical Properties of Cerchiaraite-(Mn)

Vitreous
Colour:
Deep green
Streak:
Pale green
Hardness (Mohs):
4 - 5

Crystallography of Cerchiaraite-(Mn)

Crystal System:
Tetragonal

Optical Data of Cerchiaraite-(Mn)

Type:
Uniaxial (+)
RI values:
nω = 1.745 nε = 1.765
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of Cerchiaraite-(Mn)

Formula:
Ba4Mn4Si6(O,OH,Cl)26
Essential elements:
All elements listed in formula:

Relationship of Cerchiaraite-(Mn) to other Species

Other Members of Group:
Cerchiaraite-(Al)Ba4Al4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl
Cerchiaraite-(Fe)Ba4Fe43+O3(OH)3(Si4O12)[Si2O3(OH)4]Cl
9.CF.05AshburtonitePb4Cu4(Si4O12)(HCO3)4(OH)3Cl · H2O
9.CF.10Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2O
9.CF.15ClinophosinaiteNa12(Ca,Sr)4(Si4O12)(PO4)4
9.CF.15Phosinaite-(Ce)Na13Ca2(Ce,La,Th,Nd,Pr)(Si4O12)(PO4)4
9.CF.20StrakhoviteNaBa3(Mn,Mn)4Si6O19(OH)3

Other Names for Cerchiaraite-(Mn)

Name in Other Languages:

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.

References for Cerchiaraite-(Mn)

Reference List:
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, Monatschefte, 2000, 373-384.

Palenzona, A., Bulgarelli, G., Selmi, P. (2001): La cerchiaraite della miniera di Cerchiara. Rivista Mineralogica Italiana, 2001, 243-244.

Coombs, D.S., Kawachi, Y., Miura, H., Chapell, D. (2004): Cerchiaraite and Ca-bearing noélbensonite from Woods mine, New South Wales, Australia. European Journal of Mineralogy, 16, 185-189.

Kampf, A. R., Roberts, A. C., Venance, K. E., Carbone, C., Belmonte, D., Dunning, G. E., Walstrom, R. E. (2013): Cerchiaraite-(Fe) and cerchiaraite-(Al), two new barium cyclosilicate chlorides from Italy and California, USA. Mineralogical Magazine 77, 69-80.

Internet Links for Cerchiaraite-(Mn)

Localities for Cerchiaraite-(Mn)

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia
 
  • New South Wales
    • Darling Co.
      • Tamworth
Coombs, D.S., Kawachi, Y., Miura, H., Chapell, D. (2004): Cerchiaraite and Ca-bearing noélbensonite from Woods mine, New South Wales, Australia. European Journal of Mineralogy, 16, 185-189.
Italy
 
  • Liguria
    • La Spezia Province
      • Vara Valley
        • Borghetto Vara
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, Monatschefte, 2000, 373-384. Palenzona, A., Bulgarelli, G., Selmi, P. (2001): La cerchiaraite della miniera di Cerchiara. Rivista Mineralogica Italiana, 2001, 243-244
Mineral and/or Locality  
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