Cerchiaraite-(Al) (original) (raw)

A valid IMA mineral species

About Cerchiaraite-(Al)Hide

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Formula:

Ba4Al4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl

Colour:

Blue to bluish-green

Crystal System:

Tetragonal

Name:

in allusion to relation with "cerchiaraite" (now cerchiaraite-(Mn))

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

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

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Long-form identifier:

mindat:1:1:42782:3

6415d2c0-dee4-4e29-98eb-ccaa6fb9abdd

IMA Classification of Cerchiaraite-(Al)Hide

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IMA Formula:

Ba4Al4(Si4O12)O2(OH)4Cl2[Si2O3(OH)4]

Classification of Cerchiaraite-(Al)Hide

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9.CF.25

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

Mineral SymbolsHide

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

Physical Properties of Cerchiaraite-(Al)Hide

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Colour:

Blue to bluish-green

Fracture:

Irregular/Uneven

Density:

3.69(3) g/cm3 (Measured) 3.643 g/cm3 (Calculated)

Optical Data of Cerchiaraite-(Al)Hide

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RI values:

_n_ω = 1.695(2) _n_ε = 1.677(2)

δ = 0.018

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Comments:

colorless (O), blue (E), O < E

Chemistry of Cerchiaraite-(Al)Hide

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Mindat Formula:

Ba4Al4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl

Common Impurities:

Fe(III),Mg,Fe(II),(Mn(II))

Crystallography of Cerchiaraite-(Al)Hide

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Crystal System:

Tetragonal

Class (H-M):

4/m m m _(_4/_m_2/_m_2/m ) - Ditetragonal Dipyramidal

Cell Parameters:

a = 14.317(4) Å, c = 6.0037(18) Å

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Geological Setting:

Esquire #7 and #8 claims

Type Occurrence of Cerchiaraite-(Al)Hide

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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:

Synonyms of Cerchiaraite-(Al)Hide

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Relationship of Cerchiaraite-(Al) to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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

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References for Cerchiaraite-(Al)Hide

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Reference List:

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 (1) 69-80 doi:10.1180/minmag.2013.077.1.07

Localities for Cerchiaraite-(Al)Hide

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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

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