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Cerchiaraite-(Mn)

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Formula:
Ba
 
4
Mn
 
4
Si
 
6
(O,OH,Cl)
 
26
System:TetragonalColour:Deep green
Lustre:VitreousHardness:4 - 5
Member of:Cerchiaraite Group
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)

IMA status:Approved
Strunz 8th edition ID:8/E.08-15
Nickel-Strunz 10th (pending) edition ID:9.CF.25

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

Type Locality:Cerchiara Mine, Borghetto Vara, Vara Valley, La Spezia Province, Liguria, Italy

Physical Properties of Cerchiaraite-(Mn)

Lustre: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
Maximum Birefringence:δ = 0.020

Chart 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:
Ba
 
4
Mn
 
4
Si
 
6
(O,OH,Cl)
 
26
Simplified for copy/paste:Ba4Mn4Si6(O,OH,Cl)26
Essential elements:Ba, Mn, O, Si
All elements listed in formula:Ba, Cl, H, Mn, O, Si

Relationship of Cerchiaraite-(Mn) to other Species

Member of:Cerchiaraite Group
Other Members of Group:

- +
Cerchiaraite-(Al)
Ba
 
4
Al
 
4
O
 
3
(OH)
 
3
(Si
 
4
O
 
12
)[Si
 
2
O
 
3
(OH)
 
4
]Cl
Cerchiaraite-(Fe)
Ba
 
4
Fe
3+
4
O
 
3
(OH)
 
3
(Si
 
4
O
 
12
)[Si
 
2
O
 
3
(OH)
 
4
]Cl
Related Minerals - Nickel-Strunz Grouping):

- +
9.CF.05Ashburtonite
Pb
 
4
Cu
 
4
(Si
 
4
O
 
12
)(HCO
 
3
)
 
4
(OH)
 
3
Cl · H
 
2
O
9.CF.10Kainosite-(Y)
Ca
 
2
(Y,Ce)
 
2
(Si
 
4
O
 
12
)(CO
 
3
) · H
 
2
O
9.CF.15Clinophosinaite
Na
 
12
(Ca,Sr)
 
4
(Si
 
4
O
 
12
)(PO
 
4
)
 
4
9.CF.15Phosinaite-(Ce)
Na
 
13
Ca
 
2
(Ce,La,Th,Nd,Pr)(Si
 
4
O
 
12
)(PO
 
4
)
 
4
9.CF.20Strakhovite
NaBa
 
3
(Mn,Mn)
 
4
Si
 
6
O
 
19
(OH)
 
3

Other Names for Cerchiaraite-(Mn)

Synonyms:
IMA1999-012
Other Languages:
German:Cerchiarait
Russian:Серчиараит
Spanish:Cerchiaraita

Other Information

Health Warning: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)

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Localities for Cerchiaraite-(Mn)

    The 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. ? 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
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