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
Lustre:
Adamantine
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/D.05-10
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
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
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
7 : Miscellaneous
7.9.24
7 : Oxides and Hydroxides
9 : Oxides of Ti
7 : Oxides and Hydroxides
9 : Oxides of Ti
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
Two cleavage planes
Density:
3.28 g/cm3 (Measured) 3.14 g/cm3 (Calculated)
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.
Originally reported as (Ca,Mg)(Fe,Al)2Ti4O12.4H2O; name reflects Fe content, since found to be non-essential.
Elements listed in formula:
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)°
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-spacing | Intensity |
|---|---|
| 7.86 | (100) |
| 3.27 | (80) |
| 2.63 | (40) |
| 2.562 | (80) |
| 2.108 | (40) |
| 1.914 | (70) |
| 1.573 | (40) |
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.
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.
Relationship of Cafetite to other Species
| 4.FL. | Trébeurdenite | Fe22+Fe43+O2(OH)10CO3·3H2O |
| 4.FL.05 | Woodallite | Mg6Cr2(OH)16Cl2 · 4H2O |
| 4.FL.05 | Iowaite | Mg6Fe23+(OH)16Cl2 · 4H2O |
| 4.FL.05 | Jamborite | M2+1−xMx3+(OH)2−x(SO4)x·nH2O |
| 4.FL.05 | Meixnerite | Mg6Al2(OH)16(OH)2 · 4H2O |
| 4.FL.05 | Muskoxite | Mg7Fe4O13 · 10H2O |
| 4.FL.05 | Fougèrite | Fe42+Fe23+(OH)12[CO3]·3H2O |
| 4.FL.10 | Hydrocalumite | Ca4Al2(OH)12(Cl,CO3,OH)2 · 4H2O |
| 4.FL.15 | Kuzelite | Ca4Al2(OH)12[SO4] · 6H2O |
| 4.FL.20 | Aurorite | (Mn2+,Ag,Ca)Mn34+O7 · 3H2O |
| 4.FL.20 | Chalcophanite | (Zn,Fe,Mn)Mn3O7 · 3H2O |
| 4.FL.20 | Ernienickelite | NiMn3O7 · 3H2O |
| 4.FL.20 | Jianshuiite | (Mg,Mn,Ca)Mn3O7 · 3H2O |
| 4.FL.25 | Woodruffite | Zn(Mn4+,Mn3+)5O10·3½H2O |
| 4.FL.30 | Asbolane | (Ni,Co)2-xMn4+(O,OH)4 · nH2O |
| 4.FL.35 | Buserite | Na4Mn14O27 · 21H2O |
| 4.FL.40 | Ranciéite | (Ca,Mn2+)0.2(Mn4+,Mn3+)O2 · 0.6H2O |
| 4.FL.40 | Takanelite | (Mn,Ca)Mn4O9 · H2O |
| 4.FL.45 | Birnessite | (Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O |
| 4.FL.55 | Cianciulliite | Mn(Mg,Mn)2Zn2(OH)10 · 2-4H2O |
| 4.FL.60 | Jensenite | Cu3[TeO6] · 2H2O |
| 4.FL.65 | Leisingite | CuMg2Te6+O6 · 6H2O |
| 4.FL.70 | Akdalaite | 5Al2O3 · H2O |
| 4.FL.80 | Mourite | UMo5O12(OH)10 |
| 4.FL.85 | Deloryite | Cu4(UO2)(MoO4)2(OH)6 |
| 7.9.1 | Hongquiite | TiO |
| 7.9.2 | Rutile | TiO2 |
| 7.9.3 | Anatase | TiO2 |
| 7.9.4 | Brookite | TiO2 |
| 7.9.5 | Geikielite | MgTiO3 |
| 7.9.6 | Perovskite | CaTiO3 |
| 7.9.7 | Kassite | CaTi2O4(OH)2 |
| 7.9.8 | Tausonite | SrTiO3 |
| 7.9.9 | Crichtonite | Sr(Mn,Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH)38 |
| 7.9.10 | Lucasite-(Ce) | CeTi2(O,OH)6 |
| 7.9.11 | Hibonite | (Ca,Ce)(Al,Ti,Mg)12O19 |
| 7.9.12 | Yttrocrasite-(Y) | (Y,Th,Ca,U)(Ti,Fe)2(O,OH)6 |
| 7.9.13 | Pyrophanite | Mn2+TiO3 |
| 7.9.14 | Iwakiite | Mn2+Fe23+O4 |
| 7.9.15 | Ilmenite | Fe2+TiO3 |
| 7.9.16 | Pseudobrookite | Fe2TiO5 |
| 7.9.17 | Ulvöspinel | Fe2TiO4 |
| 7.9.18 | Pseudorutile | Fe2Ti3O9 |
| 7.9.19 | Freudenbergite | Na2(Ti,Fe)8O16 |
| 7.9.20 | Kennedyite | Fe2TiO5 |
| 7.9.21 | Armalcolite | (Mg,Fe2+)Ti2O5 |
| 7.9.22 | Högbomite | (Mg,Fe)2(Al,Ti)5O10 |
| 7.9.23 | Qandilite | (Mg,Fe3+)2(Ti,Fe3+,Al)O4 |
| 7.9.25 | Loveringite | (Ca,Ce,La)(Zr,Fe)(Mg,Fe)2(Ti,Fe,Cr,Al)18O38 |
| 7.9.26 | Lindsleyite | (Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38 |
| 7.9.27 | Priderite | K(Ti74+Fe3+)O16 |
| 7.9.28 | Jeppeite | (K,Ba)2(Ti,Fe)6O13 |
| 7.9.29 | Ankangite | Ba(Ti,V3+,Cr)8O16 |
| 7.9.30 | Ecandrewsite | (Zn,Fe2+,Mn2+)TiO3 |
| 7.9.31 | Landauite | NaMnZn2(Ti,Fe)6Ti12O38 |
Other Names for Cafetite
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.
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
mindat.org URL:
https://www.mindat.org/min-850.html
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Localities for Cafetite
This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality.
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(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 | |
| 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) | |
| Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow |
| 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 |
| N.V. Chukanov et al.: Zap. Vses. Mineral. Obshch. 133(1):59-72 (2004) |
USA | |
| 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. |
Val di Serra Quarry, Pilcante, Ala, Lagarina Valley, Trento Province, Trentino-Alto Adige, Italy