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Cerchiaraite-(Fe)

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About Cerchiaraite-(Fe)Hide

Formula:
Ba4Fe3+4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl
Colour:
tan to brown; blue to bluish-green
Lustre:
Vitreous
Hardness:
Specific Gravity:
3.710 (Calculated)
Crystal System:
Tetragonal
Name:
to address the mineral relation with "cerchiaraite" (now cerchiaraite-(Mn))
The Fe analogue of cerchiaraite-(Mn) (ex-cerchiaraite) and cerchiaraite-(Al). Chemically similar to fencooperite, and somewhat to traskite and hyttsjöite.

The structure details (1) corner-sharing silicate tetrahedra, forming 4-membered rings; (2) the rings share corners with an edge-sharing chain of Fe3+O6 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-(Fe)Hide

Approved
Approval Year:
2012
9.CF.25

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

Physical Properties of Cerchiaraite-(Fe)Hide

Vitreous
Transparency:
Transparent
Colour:
tan to brown; blue to bluish-green
Comment:
tan/brown: Cerchiara; blue/bluish-green: California
Streak:
colorless to tan (Cerchiara), pale green-blue (California)
Hardness:
4½ on Mohs scale
Comment:
ca. 4.5
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
3.710 g/cm3 (Calculated)
Comment:
couldn't be measured due to fibrous habit

Optical Data of Cerchiaraite-(Fe)Hide

Type:
Uniaxial (+)
RI values:
nω = 1.741(2) nε = 1.768(2)
Max Birefringence:
δ = 0.027
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Weak
Comments:
colorless (O), yellow (E), O < E

Chemical Properties of Cerchiaraite-(Fe)Hide

Formula:
Ba4Fe3+4O3(OH)3(Si4O12)[Si2O3(OH)4]Cl
IMA Formula:
Ba4Fe3+4(Si4O12)O2(OH)4Cl2[Si2O3(OH)4]
Common Impurities:
Ti,Al

Crystallography of Cerchiaraite-(Fe)Hide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I4/mmm
Cell Parameters:
a = 14.3354(19) Å, c = 6.0151(8) Å
Ratio:
a:c = 1 : 0.42
Unit Cell V:
1230.6 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.403Å(26)
3.327Å(48)
3.016Å(70)
2.595Å(100)
2.258Å(29)
1.812Å(39)
1.411Å(43)
1.298Å(29)

Geological EnvironmentHide

Geological Setting:
quartz-sanbomite vein assemblages resulting from fluid interaction along the margin of the vein (Esquire #7 and #8 claims)

Type Occurrence of Cerchiaraite-(Fe)Hide

General Appearance of Type Material:
thin prisms and matted fibers (Italy); irregular prisms in subparallel crystal aggregates, generally less than 1 mm across (California, USA)
Place of Conservation of Type Material:
Natural History Museum of Los Angeles County, Los Angeles, California, USA, catalogue numbers 63515, 63516, 63517 and 63518
Geological Setting of Type Material:
small fractures and veinlets within metacherts of a Jurassic ophiolitic sequence; genesis: re-equilibration of the ophiolitic sequences during tectonometamorphic overprinting, aged ca. 80 Ma, in prehnite-pumpellyite facies conditions (2–3kB, 250–300oC)
Associated Minerals at Type Locality:

Synonyms of Cerchiaraite-(Fe)Hide

Relationship of Cerchiaraite-(Fe) to other SpeciesHide

Other Members of this group:
Cerchiaraite-(Al)Ba4Al4O3(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.

Common AssociatesHide

BaziriteBaZr(Si3O9)
CalciteCaCO3
DiopsideCaMgSi2O6
MuiriteBa10Ca2Mn2+Ti[HSi2O7]5(OH,Cl,F)5
PyrrhotiteFe1-xS
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
Associated Minerals Based on Photo Data:
4 photos of Cerchiaraite-(Fe) associated with SanborniteBa2(Si4O10)
4 photos of Cerchiaraite-(Fe) associated with TitantaramelliteBa4(Ti,Fe3+,Fe2+,Mg)4(B2Si8O27)O2Clx
2 photos of Cerchiaraite-(Fe) associated with QuartzSiO2

Related Minerals - Nickel-Strunz GroupingHide

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.
9.CF.15Phosinaite-(Ce)Na13Ca2(Ce,La,Th,Nd,Pr)(Si4O12)(PO4)4Orth.
9.CF.20StrakhoviteNaBa3Mn2+2Mn3+2Si6O19(OH)3Orth.
9.CF.25Cerchiaraite-(Mn)Ba4Mn3+4(Si4O12)O2(OH)4Cl2[Si2O3(OH)4]Tet.
9.CF.25Cerchiaraite-(Al)Ba4Al4O3(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.

References for Cerchiaraite-(Fe)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., Carbone, C., Dunning, G.E. and Walstrom, R.E. (2012): Cerchiaraite-(Fe), IMA 2012-012. 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-(Fe)Hide

Localities for Cerchiaraite-(Fe)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 Mountain
        • 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.; Dunning, G.E., Walstrom, R.E., Lechner, W. (2018) Barium Silicate Mineralogy of the Western Margin, North American Continent, Part Geology, Origin, Paragenesis and Mineral Distribution from Baja California Norte, Mexico, Western Canada and Alaska, USA. Baymin Journal: 19(5): 70 pgs.
Kampf, A.R., Peterson, R.C., Joy, B.R. (2014): Itsiite, Ba2Ca(BSi2O7)2, a new mineral species from Yukon, Canada: Description and crystal structure. Canadian Mineralogist, 52, 401-407.
Italy (TL)
 
  • Liguria
    • La Spezia Province
      • Borghetto di Vara
Kampf, A.R., Roberts, A.C.,Venance, K.E., Carbone, C., Dunning, G.E. and Walstrom, R.E. (2012): Cerchiaraite-(Fe), IMA 2012-012. CNMNC Newsletter No. 13, June 2012, page 815; Mineralogical Magazine, 76, 807-817.
Mexico
 
  • Baja California
    • Tres Pozos
Frank K. Mazdab collection (petrography + EPMA characterized; thin section FKM-53); Dunning, G. E., Walstrom, R. E., & Lechner, W. (2018) Barium Silicate Mineralogy of the Western Margin, North American Continent, Part Geology, Origin, Paragenesis and Mineral Distribution from Baja California Norte, Mexico, Western Canada and Alaska, USA. Baymin Journal, Vol. 19, No. 5
USA (TL)
 
  • California
    • Fresno Co.
      • Big Creek-Rush Creek Mining District
        • Rush Creek deposit
          • Big Creek
Kampf, A.R., Roberts, A.C.,Venance, K.E., Carbone, C., Dunning, G.E. and Walstrom, R.E. (2012): Cerchiaraite-(Fe), IMA 2012-012. CNMNC Newsletter No. 13, June 2012, page 815; Mineralogical Magazine, 76, 807-817.
Kampf, A.R., Roberts, A.C.,Venance, K.E., Carbone, C., Dunning, G.E. and Walstrom, R.E. (2012): Cerchiaraite-(Fe), IMA 2012-012. CNMNC Newsletter No. 13, June 2012, page 815; Mineralogical Magazine, 76, 807-817.
    • Mariposa Co.
      • East Belt
        • Clearing House Mining District
          • Clearing House
            • Trumbull Peak
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.
    • Tulare Co.
      • Dumtah
Robert E. Walstrom Collection
 
Mineral and/or Locality  
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