Yttrocrasite-(Y)
A valid IMA mineral species - grandfathered - questionable
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About Yttrocrasite-(Y)
Formula:
(Y,Th,Ca,U)(Ti,Fe)2(O,OH)6
Colour:
Black
Lustre:
Resinous
Hardness:
5½ - 6
Specific Gravity:
4.8
Crystal System:
Amorphous
Member of:
Name:
Named after its chemical composition containing yttrium and from Greek "krasis", "mixture", alluding to the many other elements present.
Type Locality:
Euxenite Group.
A poorly characterised, often metamict mineral which may be identical with euxenite-(Y).
Compare also polycrase-(Y).
A poorly characterised, often metamict mineral which may be identical with euxenite-(Y).
Compare also polycrase-(Y).
Unique Identifiers
Mindat ID:
4370
Long-form identifier:
mindat:1:1:4370:6
IMA Classification of Yttrocrasite-(Y)
Approved, 'Grandfathered' (first described prior to 1959), Questionable
IMA Formula:
(Y,Th4+,Ca,U6+,U4+)(Ti4+,Fe3+)2(O,OH)6
First published:
1906
Classification of Yttrocrasite-(Y)
4.DG.05
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
G : With large (+- medium-sized) cations; chains of edge-sharing octahedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
G : With large (+- medium-sized) cations; chains of edge-sharing octahedra
8.3.8.4
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
3 : AB2O6
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
3 : AB2O6
7.9.12
7 : Oxides and Hydroxides
9 : Oxides of Ti
7 : Oxides and Hydroxides
9 : Oxides of Ti
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Ycr-Y | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Yttrocrasite-(Y)
Resinous
Colour:
Black
Comment:
Under microscop fragments shows through their edges a amber to light yellow color
Hardness:
5½ - 6 on Mohs scale
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
4.8 g/cm3 (Measured)
Optical Data of Yttrocrasite-(Y)
Chemistry of Yttrocrasite-(Y)
Mindat Formula:
(Y,Th,Ca,U)(Ti,Fe)2(O,OH)6
Element Weights:
Common Impurities:
W
Crystallography of Yttrocrasite-(Y)
Crystal System:
Amorphous
Comment:
Metamict (may have been orthorhombic before metamictisation). Crook (1977) gives, for a non-metamict sample, the following unit-cell parameters and space group: Pbcn, a 12.862(7), b 4.810(2), c 4.571(3) Å.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 26 : Hadean detrital minerals | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites |
Type Occurrence of Yttrocrasite-(Y)
General Appearance of Type Material:
A crystal with a dull brown alteration coating and a black, fresh interior.
Synonyms of Yttrocrasite-(Y)
Other Language Names for Yttrocrasite-(Y)
Relationship of Yttrocrasite-(Y) to other Species
Member of:
Other Members of Euxenite Group:
| Euxenite-(Y) | (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Fersmite | CaNb2O6 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Kobeite-(Y) | (Y,U)(Ti,Nb)2(O,OH)6 (?) | Iso. |
| Loranskite-(Y) | (Y,Ce,Ca)ZrTaO6 (?) | |
| Tanteuxenite-(Y) | Y(Ta,Nb,Ti)2(O,OH)6 | Orth. mmm(2/m2/m2/m) : Pbcn |
| Uranopolycrase | (U4+,Y)(Ti,Nb)2O6 | Orth. mmm(2/m2/m2/m) : Pbcn |
Common Associates
Associations Based on Photo Data:
| 7 photos of Yttrocrasite-(Y) associated with Monazite-(Ce) | Ce(PO4) |
| 7 photos of Yttrocrasite-(Y) associated with 'Thorogummite' | (Th,U)(SiO4)1-x(OH)4x |
| 7 photos of Yttrocrasite-(Y) associated with Microcline | K(AlSi3O8) |
| 7 photos of Yttrocrasite-(Y) associated with Zircon | Zr(SiO4) |
| 6 photos of Yttrocrasite-(Y) associated with Chloritoid | Fe2+Al2O(SiO4)(OH)2 |
| 5 photos of Yttrocrasite-(Y) associated with Thalénite-(Y) | Y3Si3O10F |
| 5 photos of Yttrocrasite-(Y) associated with Tengerite-(Y) | Y2(CO3)3 · 2-3H2O |
| 4 photos of Yttrocrasite-(Y) associated with Allanite-(Y) | (CaY)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| 4 photos of Yttrocrasite-(Y) associated with Pyrophyllite | Al2Si4O10(OH)2 |
| 2 photos of Yttrocrasite-(Y) associated with Keiviite-(Y) | Y2Si2O7 |
Related Minerals - Strunz-mindat Grouping
| 4.DG.05 | Fersmite | CaNb2O6 |
| 4.DG.05 | Uranopolycrase | (U4+,Y)(Ti,Nb)2O6 |
| 4.DG.05 | Tanteuxenite-(Y) | Y(Ta,Nb,Ti)2(O,OH)6 |
| 4.DG.05 | Loranskite-(Y) | (Y,Ce,Ca)ZrTaO6 (?) |
| 4.DG.05 | Euxenite-(Y) | (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)2O6 |
| 4.DG.05 | Kobeite-(Y) | (Y,U)(Ti,Nb)2(O,OH)6 (?) |
| 4.DG.10 | Yttrotantalite-(Y) | (Y,U,Fe2+)(Ta,Nb)(O,OH)4 |
| 4.DG.10 | Clinofergusonite-(Y) | YNbO4 |
| 4.DG.10 | Clinofergusonite-(Nd) | (Nd,Ce)NbO4 |
| 4.DG.10 | Clinofergusonite-(Ce) | CeNbO4 |
| 4.DG.15 | Foordite | Sn2+Nb2O6 |
| 4.DG.15 | Thoreaulite | Sn2+Ta2O6 |
| 4.DG.20 | Raspite | Pb(WO4) |
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.
Internet Links for Yttrocrasite-(Y)
mindat.org URL:
https://www.mindat.org/min-4370.html
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References for Yttrocrasite-(Y)
Reference List:
Localities for Yttrocrasite-(Y)
Showing 11 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
China | |
| Yunhuai Lin and Shiyang Chen (1985) |
| Xiao et al. (2025) |
Greece | |
| www.researchgate.net (n.d.) +1 other reference |
Italy | |
| Ciriotti et al. (2021) |
| Ciriotti et al. (2021) | |
Russia | |
| Pavel M. Kartashov (n.d.) |
Sweden | |
| Pavel M. Kartashov (n.d.) +1 other reference |
USA | |
| Murdoch (1966) +1 other reference |
| Crook (1976) +1 other reference |
| Hidden and Warren (1906) |
| Crook (1976) |
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Grubependity Lake cirque, Grubependity Lake, Maldynyrd range, Kozhim River Basin, Komi Republic, Russia