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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.
System:
Monoclinic
Colour:
yellow, colourless
Hardness:
4 - 5
Name:
Named in allusion to the composition, containing CAlcium, iron (Latin = FErrum), and TItanium.
This page provides mineralogical data about Cafetite.

Classification of Cafetite

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
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Type Occurrence of Cafetite

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.
Year of Discovery:
1959
Geological Setting of Type Material:
Late hydrothermal mineral in miarolitic cavities, in pegmatite that cuts pyroxenite.

Physical Properties of Cafetite

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

Crystallography of Cafetite

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 Volume:
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 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)

Optical Data of Cafetite

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 Cafetite

Formula:
CaTi2O5 · H2O

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

Relationship of Cafetite to other Species

4.FL.TrébeurdeniteFe22+Fe43+O2(OH)10CO3·3H2O
4.FL.05WoodalliteMg6Cr2(OH)16Cl2 · 4H2O
4.FL.05IowaiteMg6Fe23+(OH)16Cl2 · 4H2O
4.FL.05Jamborite(Ni2+1-x,Cox3+(OH)2-x(SO4)x·nH2O [x ≤ ⅓; n ≤ (1 - x)]
4.FL.05MeixneriteMg6Al2(OH)16(OH)2 · 4H2O
4.FL.05MuskoxiteMg7Fe4O13 · 10H2O
4.FL.05FougèriteFe42+Fe23+(OH)12[CO3]·3H2O
4.FL.10HydrocalumiteCa4Al2(OH)12(Cl,CO3,OH)2 · 4H2O
4.FL.15KuzeliteCa4Al2(OH)12[SO4] · 6H2O
4.FL.20Aurorite(Mn2+,Ag,Ca)Mn34+O7 · 3H2O
4.FL.20Chalcophanite(Zn,Fe,Mn)Mn3O7 · 3H2O
4.FL.20ErnienickeliteNiMn3O7 · 3H2O
4.FL.20Jianshuiite(Mg,Mn)Mn3O7 · 3H2O
4.FL.25WoodruffiteZn(Mn4+,Mn3+)5O10·3½H2O
4.FL.30Asbolane(Ni,Co)2-xMn4+(O,OH)4 · nH2O
4.FL.35BuseriteNa4Mn14O27 · 21H2O
4.FL.40Ranciéite(Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O
4.FL.40Takanelite(Mn,Ca)Mn4O9 · H2O
4.FL.45Birnessite(Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O
4.FL.55CianciulliiteMn(Mg,Mn)2Zn2(OH)10 · 2-4H2O
4.FL.60JenseniteCu3[TeO6] · 2H2O
4.FL.65LeisingiteCu(Mg,Cu,Fe,Zn)2[TeO6] · 6H2O
4.FL.70Akdalaite4Al2O3 · H2O
4.FL.80MouriteUMo5O12(OH)10
4.FL.85DeloryiteCu4(UO2)(MoO4)2(OH)6
7.9.1HongquiiteTiO
7.9.2RutileTiO2
7.9.3AnataseTiO2
7.9.4BrookiteTiO2
7.9.5GeikieliteMgTiO3
7.9.6PerovskiteCaTiO3
7.9.7KassiteCaTi2O4(OH)2
7.9.8TausoniteSrTiO3
7.9.9CrichtoniteSr(Mn,Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH)38
7.9.10Lucasite-(Ce)CeTi2(O,OH)6
7.9.11Hibonite(Ca,Ce)Al12O19
7.9.12Yttrocrasite-(Y)(Y,Th,Ca,U)(Ti,Fe)2(O,OH)6
7.9.13PyrophaniteMn2+TiO3
7.9.14IwakiiteMn2+Fe23+O4
7.9.15IlmeniteFe2+TiO3
7.9.16PseudobrookiteFe2TiO5
7.9.17UlvöspinelFe2TiO4
7.9.18PseudorutileFe2Ti3O9
7.9.19FreudenbergiteNa2(Ti,Fe)8O16
7.9.20Kennedyite
7.9.21Armalcolite(Mg,Fe2+)Ti2O5
7.9.22Högbomite(Mg,Fe)2(Al,Ti)5O10
7.9.23Qandilite(Mg,Fe)2(Ti,Fe,Al)O4
7.9.25Loveringite(Ca,Ce,La)(Zr,Fe)(Mg,Fe)2(Ti,Fe,Cr,Al)18O38
7.9.26Lindsleyite(Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38
7.9.27PrideriteK(Ti74+Fe3+)O16
7.9.28Jeppeite(K,Ba)2(Ti,Fe)6O13
7.9.29AnkangiteBa(Ti,V3+,Cr)8O16
7.9.30Ecandrewsite(Zn,Fe2+,Mn2+)TiO3
7.9.31LandauiteNaMnZn2(Ti,Fe)6Ti12O38

Other Names for Cafetite

Name in Other Languages:
German:Cafetit
Spanish:Cafetita

Other Information

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 Cafetite

Reference List:
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 Cafetite

Localities for Cafetite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Italy
 
  • Trentino-Alto Adige (Trentino-Südtirol)
    • Trento Province
      • Lagarina Valley
        • Mt. Baldo
          • Ala
            • Pilcante
Bortolozzi G., Boscardin M., Rocchetti I. and Bersani D. (2013): Cafetite e kassite della cava di Pilcante in Val d'Adige (Ala, Trento). Micro, Vol 11, 1, pagg.39-48.
Russia (TL)
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Afrikanda
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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