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Cerchiaraite-(Al)

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Formula:
Ba4Al4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl
System:
Tetragonal
Colour:
Blue to bluish-green
Hardness:
Name:
in allusion to relation with "cerchiaraite" (now cerchiaraite-(Mn))
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.

Classification of Cerchiaraite-(Al)

Approved 2012
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http://www.mindat.org/min-42782.html
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Type Occurrence of Cerchiaraite-(Al)

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

Occurrences of Cerchiaraite-(Al)

Geological Setting:
Esquire #7 and #8 claims

Physical Properties of Cerchiaraite-(Al)

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

Crystallography of Cerchiaraite-(Al)

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 Volume:
V 1230.6 ų
X-Ray 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)

Optical Data of Cerchiaraite-(Al)

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)

Formula:
Ba4Al4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl
All elements listed in formula:
Analytical Data:
Electron microprobe (WDS mode), mean of 11 analytical points, wt.%, Fe division form bond valence analysis, water by stoichiometry; empirical formula basis: 27 anions pfu
BaO 44.82
MgO 0.43
MnO 0.30
Fe2O3(tot) 7.27
Fe2O3 6.55 
FeO 0.65 
Al2O3 8.94
SiO2 25.38
Cl 7.53 
O=Cl –1.70
H2O 5.76
Empirical Formula:
Ba4.00(Al3+2.40Fe3+1.12Mg0.15Fe2+0.12Mn2+0.06)∑3.85Si5.78O15.34(OH)8.75Cl2.91
Common Impurities:
Fe(III),Mg,Fe(II),(Mn(II))

Relationship of Cerchiaraite-(Al) to other Species

Other Members of Group:
Cerchiaraite-(Fe)Ba4Fe43+O3(OH)3(Si4O12)[Si2O3(OH)4]Cl
Cerchiaraite-(Mn)Ba4Mn4Si6(O,OH,Cl)26

Other Names for Cerchiaraite-(Al)

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-(Al)

Reference List:
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)

Localities for Cerchiaraite-(Al)

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.
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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