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Alcaparrosaite

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About AlcaparrosaiteHide

Formula:
K3Ti4+Fe3+(SO4)4O(H2O)2
Colour:
pale yellow
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
2.80
Crystal System:
Monoclinic
Name:
Named for the type locality.
Unique combination of elements (among the approved mineral species); currently the second purely sulfate mineral with species-defining titanium (after calamaite), and the third Ti-rich sulfate-bearing mineral (after the latter and innelite).
Compare Unnamed (Na-Ti-Fe sulfate).


Classification of AlcaparrosaiteHide

Approved
Approval Year:
2011
First Published:
2012
7.DF.

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
F : With large and medium-sized cations

Physical Properties of AlcaparrosaiteHide

Vitreous
Transparency:
Transparent
Colour:
pale yellow
Streak:
white
Hardness:
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Sub-Conchoidal
Density:
2.80(3) g/cm3 (Measured)    2.807 g/cm3 (Calculated)

Optical Data of AlcaparrosaiteHide

Type:
Biaxial (+)
RI values:
nα = 1.643(1) nβ = 1.655(1) nγ = 1.680(1)
2V:
Measured: 70° (2), Calculated: 70.3°
Max Birefringence:
δ = 0.037
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
strong parallel dispersion, r < v
Pleochroism:
Non-pleochroic

Chemical Properties of AlcaparrosaiteHide

Formula:
K3Ti4+Fe3+(SO4)4O(H2O)2

Crystallography of AlcaparrosaiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 7.5594(1) Å, b = 16.7923(3) Å, c = 12.1783(9) Å
β = 94.076(7)°
Ratio:
a:b:c = 0.45 : 1 : 0.725
Unit Cell V:
1,542.00 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Blades and tapering prisms, flattened on {010} and elongated along [100]. Observed
crystal forms are {010}, {110}, {1.13.0} and {021}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.907 Å(41)
3.628 Å(34)
3.320 Å(32)
3.096 Å(100)
3.000 Å(40)
2.704 Å(38)
1.928 Å(30)
1.841 Å(31)

Type Occurrence of AlcaparrosaiteHide

General Appearance of Type Material:
blades and tapering prisms up to 4 mm in length
Place of Conservation of Type Material:
Natural History Museum of Los Angeles County, Los Angeles, California, USA. Cat. nos. 63519, 63520 and 63521.
Geological Setting of Type Material:
oxidation of pyritic masses under increasingly arid conditions
Associated Minerals at Type Locality:
Reference:
Kampf, A.R., Mills, S.J., Housley, R.M., Williams, P.A., Dini, M. (2012) Alcaparrosaite, K3Ti4+Fe3+(SO4)4O(H2O)2, a new hydrophobic Ti4+ sulfate from Alcaparrosa, Chile. Mineralogical Magazine: 76: 851-861.

Synonyms of AlcaparrosaiteHide

Related Minerals - Nickel-Strunz GroupingHide

7.DF.Aldridgeite(Cd,Ca)(Cu,Zn)4(SO4)2(OH)6 · 3H2O Mon. 2/m : B2/b
7.DF.ChromschieffelinitePb10Te6+6O20(OH)14(CrO4)(H2O)5Orth. 2 2 2 : C2 2 21
7.DF.Ammoniomathesiusite(NH4)5(UO2)4(SO4)4(VO5)·4H2OTet. 4/m : P4/n
7.DF.05UklonskoviteNaMg(SO4)F · 2H2OMon.
7.DF.10KainiteKMg(SO4)Cl · 3H2OMon. 2/m : B2/m
7.DF.15NatrochalciteNaCu2(SO4)2(OH) · 2H2OMon. 2/m : B2/m
7.DF.20MetasideronatriteNa2Fe(SO4)2(OH) · H2OOrth. mmm (2/m 2/m 2/m)
7.DF.20SideronatriteNa2Fe(SO4)2(OH) · 3H2OOrth. 2 2 2 : P21 21 21
7.DF.25DespujolsiteCa3Mn4+(SO4)2(OH)6 · 3H2OHex. 6 m2 : P62c
7.DF.25FleischeritePb3Ge(SO4)2(OH)6 · 3H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
7.DF.25SchaurteiteCa3Ge(SO4)2(OH)6 · 4H2OHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
7.DF.25MallestigitePb3Sb5+(SO4)(AsO4)(OH)6 · 3H2OHex. 6 : P63
7.DF.30Slavíkite(H3O+)3Mg6Fe15(SO4)21(OH)18 · 98H2OTrig. 3 : R3
7.DF.35MetavoltineNa6K2FeFe6(SO4)12O2 · 18H2OTrig.
7.DF.40LannoniteMg2Ca4Al4(SO4)8F8 · 24H2O Tet. 4/m : I4/m
7.DF.40VlodavetsiteAlCa2(SO4)2F2Cl · 4H2OTet. 4/m : I4/m
7.DF.45PeretaiteCa(SbO)4(SO4)2(OH)2 · 2H2OMon. 2/m : B2/b
7.DF.50GordaiteNaZn4(SO4)(OH)6Cl · 6H2OTrig. 3 : P3
7.DF.55Clairite(NH4)2Fe3(SO4)4(OH)3 · 3H2OTric.
7.DF.60ArzruniteCu4Pb2(SO4)(OH)4Cl6 · 2H2O (?)Orth.
7.DF.65ElyitePb4Cu(SO4)O2(OH)4 · H2OMon. 2/m
7.DF.70YecoraiteFe3+3Bi5(Te6+O4)2(Te4+O3)O9 · 9H2O
7.DF.75RiomarinaiteBi(SO4)(OH) · H2OMon. 2/m
7.DF.80DukeiteBi3+24Cr6+8O57(OH)6 · 3H2OTrig. 3m : P3 1c
7.DF.85XocolatliteCa2Mn4+2(Te6+O6)2 · H2OMon. 2/m : P2/m

Fluorescence of AlcaparrosaiteHide

Other InformationHide

Notes:
Hydrophobic, insoluble in cold and hot water, very slowly soluble in acids and decomposes slowly in bases.
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 AlcaparrosaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Mills, S.J., Housley, R.M., Dini, M. (2011) Alcaparrosaite, IMA 2011-024. CNMNC Newsletter No. 10, October 2011, page 2553.
Kampf, A.R., Mills, S.J., Housley, R.M., Williams, P.A., Dini, M. (2012) Alcaparrosaite, K3Ti4+Fe3+(SO4)4O(H2O)2, a new hydrophobic Ti4+ sulfate from Alcaparrosa, Chile. Mineralogical Magazine: 76: 851-861.

Internet Links for AlcaparrosaiteHide

Localities for AlcaparrosaiteHide

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.
Chile (TL)
 
  • Antofagasta
    • El Loa Province
      • Calama
        • Cerritos Bayos
Kampf, A.R.; Mills, S.J.; Housley, R.M.; Williams, P.A.; Dini, M. (2012): Alcaparrosaite, K3Ti4+Fe3+(SO4)4O(H2O)2, a new hydrophobic Ti4+ sulfate from Alcaparrosa, Chile. Mineralogical Magazine 76, 851-861.
Italy
 
  • Campania
    • Naples
      • Pozzuoli
- Russo, M., Campostrini, I., Demartin, F. (2017): I minerali di origine fumarolica dei Campi Flegrei: Solfatara di Pozzuoli (Napoli) e dintorni. Micro, 15, 122-192.
 
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