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Cerchiaraite-(Al)

A valid IMA mineral species
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08455500015781238173573.jpg
Cerchiaraite-(Al), etc.

Snow Cap Mine, Rush Creek, Big Creek-Rush Creek Mining District, Fresno County, California, USA
09194230017056208289135.jpg
Cerchiaraite-(Al)

Esquire No. 1 claim, Rush Creek, Big Creek-Rush Creek Mining District, Fresno County, California, USA
08455500015781238173573.jpg
Cerchiaraite-(Al), etc.

Snow Cap Mine, Rush Creek, Big Creek-Rush Creek Mining District, Fresno County, California, USA
09194230017056208289135.jpg
Cerchiaraite-(Al)

Esquire No. 1 claim, Rush Creek, Big Creek-Rush Creek Mining District, Fresno County, California, USA
08455500015781238173573.jpg
Cerchiaraite-(Al), etc.

Snow Cap Mine, Rush Creek, Big Creek-Rush Creek Mining District, Fresno County, California, USA
09194230017056208289135.jpg
Cerchiaraite-(Al)

Esquire No. 1 claim, Rush Creek, Big Creek-Rush Creek Mining District, Fresno County, California, USA
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About Cerchiaraite-(Al)Hide

Formula:
Ba4Al4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl
Colour:
Blue to bluish-green
Lustre:
Vitreous
Hardness:
4½
Specific Gravity:
3.69
Crystal System:
Tetragonal
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.


Unique IdentifiersHide

Mindat ID:
42782
Long-form identifier:
mindat:1:1:42782:3
GUID
(UUID V4):
6415d2c0-dee4-4e29-98eb-ccaa6fb9abdd

IMA Classification of Cerchiaraite-(Al)Hide

IMA status:
Approved
IMA Formula:
Ba4Al4(Si4O12)O2(OH)4Cl2[Si2O3(OH)4]
Approval year:
2012

Classification of Cerchiaraite-(Al)Hide

Strunz-mindat (2024):
9.CF.25

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
Ccr-AlIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of Cerchiaraite-(Al)Hide

Lustre:
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(2) 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

Chemistry of Cerchiaraite-(Al)Hide

Mindat Formula:
Ba4Al4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl
Elements listed:
Al, Ba, Cl, H, O, Si - search for minerals with similar chemistry
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 Å(39)
4.407 Å(39)
3.316 Å(74)
3.009 Å(100)
2.580 Å(93)
2.029 Å(43)
1.880 Å(68)
1.403 Å(54)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47)
Geological Setting:
Esquire #7 and #8 claims

Type Occurrence of Cerchiaraite-(Al)Hide

Co-Type Localities:
ⓘ Esquire No. 7 claim, Big Creek, Big Creek-Rush Creek Mining District, Fresno County, California, USA
ⓘ Esquire No. 8 claim, Big Creek, Big Creek-Rush Creek Mining District, Fresno County, California, USA
ⓘ Esquire No. 1 claim, Rush Creek, Big Creek-Rush Creek Mining District, Fresno County, California, USA
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:
WitheriteTraskiteTitantaramelliteSanborniteQuartz
OpalGoethiteDiopsideBazirite

Synonyms of Cerchiaraite-(Al)Hide

Relationship of Cerchiaraite-(Al) to other SpeciesHide

Member of:
Cerchiaraite Group
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)Ba4Mn3+4(Si4O12)O2(OH)4Cl2[Si2O3(OH)4]Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Cerchiaraite-(Al) associated with SanborniteBa2(Si4O10)
1 photo of Cerchiaraite-(Al) associated with TitantaramelliteBa4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2Clx
1 photo of Cerchiaraite-(Al) associated with QuartzSiO2

Related Minerals - Strunz-mindat GroupingHide

9.CF.BobmeyeritePb4(Al3Cu)(Si4O12)(S0.5Si0.5O4)(OH)7Cl(H2O)3Orth. mmm (2/m 2/m 2/m) : Pnnm
9.CF.05AshburtonitePb4Cu4(Si4O12)(HCO3)4(OH)3Cl · H2OTet.
9.CF.10Kainosite-(Y)Ca2(Y,Ce)2(Si4O12)(CO3) · H2OOrth. mmm (2/m 2/m 2/m)
9.CF.15ClinophosinaiteNa12(Ca,Sr)4(Si4O12)(PO4)4Mon. 2/m : P2/b
9.CF.15Phosinaite-(Ce)Na13Ca2(Ce,La,Th,Nd,Pr)(Si4O12)(PO4)4Orth. 2 2 2 : P21 21 2
9.CF.20StrakhoviteNaBa3Mn2+2Mn3+2Si6O19(OH)3Orth. mmm (2/m 2/m 2/m)
9.CF.25Cerchiaraite-(Mn)Ba4Mn3+4(Si4O12)O2(OH)4Cl2[Si2O3(OH)4]Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
9.CF.25Cerchiaraite-(Fe)Ba4Fe3+4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm

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.

Internet Links for Cerchiaraite-(Al)Hide

References 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 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.
Canada
 
  • Yukon
    • Watson Lake mining district
      • Itsi Mountain
        • Wilson Lake
McNeil et al. (2013) +1 other reference
Sweden
 
  • Örebro County
    • Askersund
      • Zinkgruvan
Cámara et al. (2021)
USA (TL)
 
  • California
    • Fresno County
      • Big Creek-Rush Creek Mining District
        • Big Creek
Williams et al. (2012) +2 other references
Williams et al. (2012) +2 other references
        • Rush Creek
Walstrom (n.d.) +3 other references
Walstrom (n.d.)
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