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Cafetite

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Formula:
CaTi2O5 · H2O
Originally reported as (Ca,Mg)(Fe,Al)2Ti4O12.4H2O; name reflects Fe content, since found to be non-essential.
Colour:
yellow, colourless
Lustre:
Adamantine
Hardness:
4 - 5
Specific Gravity:
3.28
Crystal System:
Monoclinic
Name:
Named in allusion to the composition, containing CAlcium, iron (Latin = FErrum), and TItanium.
This page provides mineralogical data about Cafetite.


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Classification of CafetiteHide

Approved
4.FL.75

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
L : Hydroxides with H2O +- (OH); sheets of edge-sharing octahedra
8.7.3.1

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
7 : Miscellaneous
7.9.24

7 : Oxides and Hydroxides
9 : Oxides of Ti

Physical Properties of CafetiteHide

Adamantine
Transparency:
Transparent
Colour:
yellow, colourless
Streak:
white
Hardness:
4 - 5 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Two cleavage planes
Density:
3.28 g/cm3 (Measured)    3.14 g/cm3 (Calculated)

Optical Data of CafetiteHide

Type:
Biaxial (-)
RI values:
nα = 1.950 nβ = 2.080 nγ = 2.110
2V:
Measured: 36.5° to 39°, Calculated: 48°
Max Birefringence:
δ = 0.160
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
strong
Optical Extinction:
Z ∧ c=2 ◦ –4 Z ^ c = 2-4°

Chemical Properties of CafetiteHide

Formula:
CaTi2O5 · H2O

Originally reported as (Ca,Mg)(Fe,Al)2Ti4O12.4H2O; name reflects Fe content, since found to be non-essential.

Crystallography of CafetiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 4.9436(15) Å, b = 12.109(4) Å, c = 15.911(5) Å
β = 98.937(5)°
Ratio:
a:b:c = 0.408 : 1 : 1.314
Unit Cell V:
940.9 ų
Z:
8
Morphology:
Columnar to acicular crystals, elongated || z and with striated prism faces. Forms {100}, {520}, {210}. Fibrous masses, radiating aggregates.
Comment:
Space group setting is P21/n !

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.86 (100)
3.27 (80)
2.63 (40)
2.562 (80)
2.108 (40)
1.914 (70)
1.573 (40)

Type Occurrence of CafetiteHide

Place of Conservation of Type Material:
Mineralogical Museum, St. Petersburg University, St. Petersburg, 13420-21;
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 72024.
Geological Setting of Type Material:
Late hydrothermal mineral in miarolitic cavities, in pegmatite that cuts pyroxenite.

Other Language Names for CafetiteHide

German:Cafetit
Spanish:Cafetita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Lizardite4 photos of Cafetite associated with Lizardite on mindat.org.
Perovskite3 photos of Cafetite associated with Perovskite on mindat.org.
Calcite3 photos of Cafetite associated with Calcite on mindat.org.
Kassite3 photos of Cafetite associated with Kassite on mindat.org.
Titanite2 photos of Cafetite associated with Titanite on mindat.org.
Natrolite1 photo of Cafetite associated with Natrolite on mindat.org.
Pyroaurite-2H1 photo of Cafetite associated with Pyroaurite-2H on mindat.org.
Knopite1 photo of Cafetite associated with Knopite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.FL.TrébeurdeniteFe2+2Fe3+4O2(OH)10CO3·3H2OTrig. 3m (3 2/m) : R3m
4.FL.05WoodalliteMg6Cr2(OH)16Cl2 · 4H2OTrig.
4.FL.05IowaiteMg6Fe3+2(OH)16Cl2 · 4H2OTrig. 3m (3 2/m) : R3m
4.FL.05JamboriteNi2+1-xCo3+x(OH)2-x(SO4)x · nH2OTrig. 3m (3 2/m) : R3m
4.FL.05MeixneriteMg6Al2(OH)16(OH)2 · 4H2OTrig. 3m (3 2/m) : R3m
4.FL.05MuskoxiteMg7Fe4O13 · 10H2OTrig. 3m (3 2/m)
4.FL.05FougèriteFe2+4Fe3+2(OH)12[CO3]·3H2OTrig. 3m (3 2/m) : R3m
4.FL.10HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2OMon. 2 : P21
4.FL.15KuzeliteCa4Al2(OH)12[SO4] · 6H2OTrig.
4.FL.20Aurorite(Mn2+,Ag,Ca)Mn4+3O7 · 3H2OTrig. 3 : R3
4.FL.20Chalcophanite(Zn,Fe,Mn)Mn3O7 · 3H2OTrig. 3 : R3
4.FL.20ErnienickeliteNiMn3O7 · 3H2OTrig. 3 : R3
4.FL.20Jianshuiite(Mg,Mn,Ca)Mn3O7 · 3H2OTrig. 3 : R3
4.FL.25WoodruffiteZn2+x/2(Mn4+1-xMn3+x)O2·yH2OMon. 2/m : B2/m
4.FL.30Asbolane(Ni,Co)2-xMn4+(O,OH)4 · nH2OHex.
4.FL.35BuseriteNa4Mn14O27 · 21H2O
4.FL.40Ranciéite(Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2OTrig. 3 : P3
4.FL.40Takanelite(Mn,Ca)Mn4O9 · H2OHex.
4.FL.45Birnessite(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2OMon. 2/m : B2/m
4.FL.55CianciulliiteMn(Mg,Mn)2Zn2(OH)10 · 2-4H2OMon. 2/m : B2/m
4.FL.60JenseniteCu3[TeO6] · 2H2OMon. 2/m : P21/m
4.FL.65LeisingiteCuMg2Te6+O6 · 6H2OTrig. 3 : P3
4.FL.70Akdalaite5Al2O3 · H2OHex.
4.FL.80MouriteUMo5O12(OH)10Mon.
4.FL.85DeloryiteCu4(UO2)(MoO4)2(OH)6Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.9.1HongquiiteTiO
7.9.2RutileTiO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
7.9.3AnataseTiO2Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
7.9.4BrookiteTiO2Orth. mmm (2/m 2/m 2/m)
7.9.5GeikieliteMgTiO3Trig. 3 : R3
7.9.6PerovskiteCaTiO3Orth. mmm (2/m 2/m 2/m) : Pnma
7.9.7KassiteCaTi2O4(OH)2Orth.
7.9.8TausoniteSrTiO3Iso. 4 3m
7.9.9CrichtoniteSr(Mn,Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH)38Trig. 3 : R3
7.9.10Lucasite-(Ce)CeTi2(O,OH)6Mon.
7.9.11Hibonite(Ca,Ce)(Al,Ti,Mg)12O19Hex.
7.9.12Yttrocrasite-(Y)(Y,Th,Ca,U)(Ti,Fe)2(O,OH)6Amor.
7.9.13PyrophaniteMn2+TiO3Trig. 3 : R3
7.9.14IwakiiteMn2+Fe3+2O4Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
7.9.15IlmeniteFe2+TiO3Trig. 3 : R3
7.9.16PseudobrookiteFe2TiO5Orth. mmm (2/m 2/m 2/m)
7.9.17UlvöspinelFe2TiO4Iso.
7.9.18PseudorutileFe2Ti3O9Hex.
7.9.19FreudenbergiteNa2(Ti,Fe)8O16Mon.
7.9.20KennedyiteFe2TiO5
7.9.21Armalcolite(Mg,Fe2+)Ti2O5Orth. mmm (2/m 2/m 2/m)
7.9.22Högbomite(Mg,Fe)2(Al,Ti)5O10Hex.
7.9.23Qandilite(Mg,Fe3+)2(Ti,Fe3+,Al)O4
7.9.25Loveringite(Ca,Ce,La)(Zr,Fe)(Mg,Fe)2(Ti,Fe,Cr,Al)18O38Trig.
7.9.26Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38Trig.
7.9.27PrideriteK(Ti4+7Fe3+)O16Tet.
7.9.28Jeppeite(K,Ba)2(Ti,Fe)6O13Mon.
7.9.29AnkangiteBa(Ti,V3+,Cr)8O16Tet. 4/m : I4/m
7.9.30Ecandrewsite(Zn,Fe2+,Mn2+)TiO3Trig. 3 : R3
7.9.31LandauiteNaMnZn2(Ti,Fe)6Ti12O38Trig. 3 : R3

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 CafetiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist: 45: 476.
Krivovichev S V, Yakovenchuk V N, Burns P C, Pakhomovsky Y A, Menshikov Y P (2003): Cafetite, Ca[Ti2O5](H2O): Crystal structure and revision of chemical formula. American Mineralogist, 88, 424-429.
Bortolozzi G., Boscardini M., Rocchetti I. and Bersani D. (2013): Cafetite e kassite della cava di Pilcante in Val d'Adige (Ala, Trento). Micro, 11 (1), 39-48.

Internet Links for CafetiteHide

Localities for CafetiteHide

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.
Italy
 
  • Trentino-Alto Adige (Trentino-Südtirol)
    • Trento Province
      • Lagarina Valley
        • Ala
          • Pilcante
Bortolozzi, G., Boscardin, M., Rocchetti, I., Bersani, D. (2013): Cafetite e kassite della cava di Pilcante in Val d'Adige (Ala, Trento). Micro, 11, 1, 39-48.
Russia (TL)
 
  • Northern Region
    • Murmanskaya Oblast'
Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
      • Khibiny Massif
Pekov, I.V. & Podlesnyi, A.S. (2004): Kukisvumchorr Deposit: Mineralogy of Alkaline Pegmatites and Hydrotermalites. Mineralogical Almanac, vol. 7, 140 pages + xxiv photo's pages
      • Kovdor Massif
N.V. Chukanov et al.: Zap. Vses. Mineral. Obshch. 133(1):59-72 (2004)
USA
 
  • Montana
    • Meagher Co.
Chakhmouradian A.R., Mitchell R.H. (2002): The mineralogy of Ba- and Zr-rich alkaline pegmatites from Gordon Butte, Crazy Mountains (Montana, USA): comparisons between potassic and sodic agpaitic pegmatites. Contrib. Mineral. Petrol., 143, 93-114.
Mineral and/or Locality  
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