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Yttrocrasite-(Y)

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Formula:
(Y,Th,Ca,U)(Ti,Fe)
 
2
(O,OH)
 
6
System:AmorphousColour:Black
Hardness:5½ - 6
Name:Named after its chemical composition containing yttrium and from Greek "krasis", "mixture", alluding to the many other elements present.


Euxenite Group.

A poorly characterised metamict mineral.
Compare Polycrase-(Y).

Classification of Yttrocrasite-(Y)

IMA status:Approved
Strunz 8th edition ID:4/D.19-20
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:8.3.8.4

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
3 : AB2O6
Hey's CIM Ref.:7.9.12

7 : Oxides and Hydroxides
9 : Oxides of Ti
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Type Occurrence of Yttrocrasite-(Y)

Type Locality:Unnamed pegmatite, Burnet Co., Texas, USA
General Appearance of Type Material:A crystal with a dull brown alteration coating and a black, fresh interior.

Physical Properties of Yttrocrasite-(Y)

Lustre:Resinous
Colour:Black
Comment:Under microscop fragments shows through their edges a amber to light yellow color
Hardness (Mohs):5½ - 6
Fracture:Irregular/Uneven, Sub-Conchoidal
Density (measured):4.8 g/cm3

Crystallography of Yttrocrasite-(Y)

Crystal System:Amorphous
Comment:Metamict (may have been orthorhombic before metamictisation).

Optical Data of Yttrocrasite-(Y)

Type:Isotropic

Chemical Properties of Yttrocrasite-(Y)

Formula:
(Y,Th,Ca,U)(Ti,Fe)
 
2
(O,OH)
 
6
Simplified for copy/paste:(Y,Th,Ca,U)(Ti,Fe)2(O,OH)6
Essential elements:O, Ti, Y
All elements listed in formula:Ca, Fe, H, O, Th, Ti, U, Y
Common Impurities:W

Relationship of Yttrocrasite-(Y) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.DG.05Euxenite-(Y)
(Y,Ca,Ce,U,Th)(Nb,Ti,Ta)
 
2
O
 
6
4.DG.05Fersmite
(Ca,Y)(Nb,Ta,Ti)
 
2
(O,OH)
 
6
4.DG.05Kobeite-(Y)
(Y,Zr)
 
2
(Ti,Fe
3+
 
)
 
2
(O,OH)
 
7
4.DG.05Loranskite-(Y)
(Y,Ce,Ca)ZrTaO
 
6
(?)
4.DG.05Polycrase-(Y)
(Y,U)(Ti,Nb)
 
2
O
 
6
4.DG.05Tanteuxenite-(Y)
(Y,Ce,Ca)(Ta,Nb,Ti)
 
2
(O,OH)
 
6
4.DG.05Uranopolycrase
(U
4+
 
,Y)(Ti,Nb)
 
2
O
 
6
4.DG.10β-Fergusonite-(Y)
YNbO
 
4
4.DG.10β-Fergusonite-(Nd)
(Nd,Ce)NbO
 
4
4.DG.10β-Fergusonite-(Ce)
(Ce,La,Nd)NbO
 
4
4.DG.10Yttrotantalite-(Y)
(Y,Ca,U
4+
 
,Fe
2+
 
)
 
2
(Ta,Nb)
 
2
O
 
8
4.DG.10Beta-Fergusonite-(Nd)
4.DG.15Foordite
(Sn,Pb)(Nb,Ta)
 
2
O
 
6
4.DG.15Thoreaulite
(Sn
2+
 
,Pb)(Ta,Nb)
 
2
O
 
6
4.DG.20Raspite
Pb(WO
 
4
)
Related Minerals - Hey's Index Grouping:

- +
7.9.1Hongquiite
TiO
7.9.2Rutile
TiO
 
2
7.9.3Anatase
TiO
 
2
7.9.4Brookite
TiO
 
2
7.9.5Geikielite
MgTiO
 
3
7.9.6Perovskite
CaTiO
 
3
7.9.7Kassite
CaTi
 
2
O
 
4
(OH)
 
2
7.9.8Tausonite
SrTiO
 
3
7.9.9Crichtonite
(Sr,La,Ce,Y)(Ti,Fe
3+
 
,Mn)
 
21
O
 
38
7.9.10Lucasite-(Ce)
CeTi
 
2
(O,OH)
 
6
7.9.11Hibonite
(Ca,Ce)Al
 
12
O
 
19
7.9.13Pyrophanite
Mn
2+
 
TiO
 
3
7.9.14Iwakiite
Mn(Fe,Mn)
 
2
O
 
4
7.9.15Ilmenite
Fe
2+
 
TiO
 
3
7.9.16Pseudobrookite
Fe
 
2
TiO
 
5
7.9.17Ulvöspinel
Fe
 
2
TiO
 
4
7.9.18Pseudorutile
Fe
 
2
Ti
 
3
O
 
9
7.9.19Freudenbergite
Na
 
2
(Ti,Fe)
 
8
O
 
16
7.9.20Kennedyite
MgFe
3+
2
Ti
 
3
O
 
10
7.9.21Armalcolite
(Mg,Fe
2+
 
)Ti
 
2
O
 
5
7.9.22Högbomite
(Mg,Fe)
 
2
(Al,Ti)
 
5
O
 
10
7.9.23Qandilite
(Mg,Fe)
 
2
(Ti,Fe,Al)O
 
4
7.9.24Cafetite
(Ca,Mg)(Fe,Al)
 
2
Ti
 
4
O
 
12
· 4H
 
2
O
7.9.25Loveringite
(Ca,Ce)(Ti,Fe,Cr,Mg)
 
21
O
 
38
7.9.26Lindsleyite
(Ba,Sr)(Ti,Zr,Fe,Cr)
 
21
O
 
38
7.9.27Priderite
K(Ti
4+
7
Fe
3+
 
)O
 
16
7.9.28Jeppeite
(K,Ba)
 
2
(Ti,Fe)
 
6
O
 
13
7.9.29Ankangite
Ba(Ti,V
3+
 
,Cr)
 
8
O
 
16
7.9.30Ecandrewsite
(Zn,Fe
2+
 
,Mn
2+
 
)TiO
 
3
7.9.31Landauite
NaMnZn
 
2
(Ti,Fe)
 
6
Ti
 
12
O
 
38

Other Names for Yttrocrasite-(Y)

Synonyms:
Yttrocrasite
Other Languages:
German:Yttrocrasit
Simplified Chinese:钛钇钍矿
Spanish:Yttrocrasita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Yttrocrasite-(Y)

Reference List:

- +
Hidden, W.E. and Warren, C.H. (1906): Yttrocrasite, A New Yttrium-Thorium-Uranium Titanate. American Journal of Science, 4th. series: 22: 515-519.

Zambonini (1908), Zs. Kr.: 45: 76.

Palache, Charles, Harry Berman & Clifford Frondel (1944) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 793.

American Mineralogist (1982): 67: 156.

Internet Links for Yttrocrasite-(Y)

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  • Raman and XRD data at RRUFF project
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  • Yttrocrasite-(Y) details from Handbook of Mineralogy (PDF)
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  • Localities for Yttrocrasite-(Y)

    (TL) indicates type locality. ? 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.
    China
     
    • Jiangxi Province
      • Ganzhou Prefecture
        • Longnan Co.
    Yunhuai Lin and Shiyang Chen (1985): Geology and Prospecting 21(3), 23-31
    Russia
     
    • Northern Region
      • Komi Republic
        • Prepolar Ural
          • Kozhim River Basin
            • Maldynyrd (Maldy-nyrd) range
              • Grubependity Lake
    Pavel M. Kartashov data
    Sweden
     
    • Värmland
      • Filipstad
        • Persberg district
    P.M. Kartashov data
    USA
     
    • California
      • Riverside Co.
        • Nuevo
    Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 390; Mineralogical Record (1976): 7: 182.
    • Texas
      • Burnet Co.
    Crook III, W.W (1976): Yttrocrasite from central Texas. Mineralogical Record 7: 182-183
    Hidden and Warren (1906), American Journal of Science, 4th. series: 22: 515-519.
      • Llano Co.
        • Bluffton
    [MinRec 7:182-183]
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