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Cerchiaraite-(Al)

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The Al analogue of cerchiaraite-(Mn) (ex-cerchiaraite) and cerchiaraite-(Fe). Chemically related to meierite.

The structure details (1) corner-sharing silicate tetrahedra, forming 4-membered rings; (2) the rings share corners with an edge-sharing chain of AlO6 octahedra || c; (3) the rings alternate with Cl sites alternates along c; (4) large channels in the framework host Ba around their peripheries, statistically distributed Si2O3(OH)4 dimers, and Cl atoms.


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Classification of Cerchiaraite-(Al)Hide

Approved
Approval Year:
2012

Physical Properties of Cerchiaraite-(Al)Hide

Vitreous
Transparency:
Transparent
Colour:
Blue to bluish-green
Streak:
Pale blue-green
Hardness:
4½ on Mohs scale
Comment:
ca. 4.5
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
3.69(3) g/cm3 (Measured)    3.643 g/cm3 (Calculated)

Optical Data of Cerchiaraite-(Al)Hide

Type:
Uniaxial (-)
RI values:
nω = 1.695() nε = 1.677(2)
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Strong
Comments:
colorless (O), blue (E), O < E

Chemical Properties of Cerchiaraite-(Al)Hide

Formula:
Ba4Al4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl
IMA Formula:
Ba4Al4(Si4O12)O2(OH)4Cl2[Si2O3(OH)4]
Common Impurities:
Fe(III),Mg,Fe(II),(Mn(II))

Crystallography of Cerchiaraite-(Al)Hide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I4/mmm
Cell Parameters:
a = 14.317(4) Å, c = 6.0037(18) Å
Ratio:
a:c = 1 : 0.419
Unit Cell V:
1230.6 ų

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.15(39)
4.407(39)
3.316(74)
3.009(100)
2.580(93)
2.029(43)
1.880(68)
1.403(54)

Type Occurrence of Cerchiaraite-(Al)Hide

General Appearance of Type Material:
subparallel aggregates of irregular prisms, generally less than 1 mm across
Place of Conservation of Type Material:
Natural History Museum of Los Angeles County, Los Angeles, California, USA, catalogue numbers 63519, 63517 and 63518
Geological Setting of Type Material:
quartz-sanbomite vein assemblages resulting fromfluid interaction along the margin of the vein; associated minerals concert Esquire # 1 claim
Associated Minerals at Type Locality:

Synonyms of Cerchiaraite-(Al)Hide

Other Language Names for Cerchiaraite-(Al)Hide

Relationship of Cerchiaraite-(Al) to other SpeciesHide

Other Members of this group:
Cerchiaraite-(Fe)Ba4Fe3+4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
Cerchiaraite-(Mn)Ba4Mn4Si6(O,OH,Cl)26Tet.

Common AssociatesHide

BaziriteBaZr(Si3O9)
CalciteCaCO3
Cerchiaraite-(Fe)Ba4Fe3+4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl
DiopsideCaMgSi2O6
MuiriteBa10Ca2Mn2+Ti[(OH,Cl,F)|HSi2O7]5
PyrrhotiteFe7S8
TitantaramelliteBa4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2Clx
Tobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)
TraskiteBa21Ca(Fe2+,Mn,Ti)4(Ti,Fe,Mg)12(Si12O36)(Si2O7)6(O,OH)30Cl6·14H2O
WitheriteBaCO3

Other InformationHide

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-(Al)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Roberts, A.C., Venance, K.E., Dunning, G.E., Walstrom, R.E. (2012) Cerchiaraite-(Al), IMA 2012-011. CNMNC Newsletter No. 13, June 2012, page 815. Mineralogical Magazine: 76: 807-817.
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-(Al)Hide

Localities for Cerchiaraite-(Al)Hide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Canada
 
  • Yukon
    • Watson Lake Mining District
      • Itsi Mt.
        • Wilson Lake
McNeil, L.A., Peterson, R.C., Färber, G., Groat, L. & Witzke, T. (2013) Mineralogical studies of a low-temperature barium-rich skarn deposit, Gunn claim, Yukon Territory. Abstract with Program, Min. Ass. Canada Annual Mtg. Winnipeg, May 2013.
USA (TL)
 
  • California
    • Fresno Co.
      • Big Creek-Rush Creek District
        • Rush Creek deposit
          • Big Creek
Kampf, A.R., Roberts, A.C., Venance, K.E., Dunning, G.E. and Walstrom, R.E. (2012): Cerchiaraite-(Al), IMA 2012-011. CNMNC Newsletter No. 13, June 2012, page 815; Mineralogical Magazine, 76, 807-817
Kampf, A.R., Roberts, A.C., Venance, K.E., Dunning, G.E. and Walstrom, R.E. (2012): Cerchiaraite-(Al), IMA 2012-011. CNMNC Newsletter No. 13, June 2012, page 815; Mineralogical Magazine, 76, 807-817
          • Rush Creek
Kampf, A.R., Roberts, A.C., Venance, K.E., Dunning, G.E. and Walstrom, R.E. (2012): Cerchiaraite-(Al), IMA 2012-011. CNMNC Newsletter No. 13, June 2012, page 815; Mineralogical Magazine, 76, 807-817
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