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Hochelagaite

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Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville Co., Québec, Canada
© Stephan Wolfsried

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Formula:
(Ca,Na,Sr)(Nb,Ti,Si,Al)
 
4
O
 
11
·8H
 
2
O
System:MonoclinicHardness:4
This page provides mineralogical data about Hochelagaite.

Classification of Hochelagaite

IMA status:Approved
Strunz 8th edition ID:4/D.06-50
Nickel-Strunz 10th (pending) edition ID:4.FM.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
M : Hydroxides with H2O +- (OH); unclassified
Dana 8th edition ID:8.6.1.2

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
6 : (AB)6O11·nH2O
Hey's CIM Ref.:18.1.14

18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U
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Type Occurrence of Hochelagaite

Co-type Localities:Francon quarry, St. Michel District, Montréal, Jacques Cartier Co., Québec, Canada
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville Co., Québec, Canada
Year of Discovery:1986

Physical Properties of Hochelagaite

Hardness (Mohs):4

Crystallography of Hochelagaite

Crystal System:Monoclinic
Cell Parameters:a = 19.88Å, b = 12.83Å, c = 6.44Å
β = 93.2°
Ratio:a:b:c = 1.549 : 1 : 0.502
Unit Cell Volume:V 1,640.03 ų (Calculated from Unit Cell)

Optical Data of Hochelagaite

Type:Biaxial (+)
RI values: nα = 1.720 nβ = 1.810 nγ = 1.820
2V:Measured: 35° , Calculated: 34°
Maximum Birefringence:δ = 0.100

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:r < v moderate

Chemical Properties of Hochelagaite

Formula:
(Ca,Na,Sr)(Nb,Ti,Si,Al)
 
4
O
 
11
·8H
 
2
O
Essential elements:Ca, H, Nb, O
All elements listed in formula:Al, Ca, H, Na, Nb, O, Si, Sr, Ti
Common Impurities:Ti,Si,Al

Relationship of Hochelagaite to other Species

Related Minerals - Nickel-Strunz Grouping):
4.FM.15Franconite
Na
 
2
Nb
 
4
O
 
11
·9H
 
2
O
4.FM.15Ternovite
(Mg,Ca)Nb
 
4
O
 
11
·nH
 
2
O
4.FM.25Belyankinite
Ca
 
1-2
(Ti,Zr,Nb)
 
5
O
 
12
 · 9H
 
2
O (?)
4.FM.25Gerasimovskite
(Mn,Ca)(Nb,Ti)
 
5
O
 
12
·9H
 
2
O
4.FM.25Manganbelyankinite
(Mn,Ca)(Ti,Nb)
 
5
O
 
12
·9H
 
2
O
4.FM.30Silhydrite
3SiO
 
2
·H
 
2
O
4.FM.35Cuzticite
Fe
3+
2
[TeO
 
6
] · 3H
 
2
O
4.FM.40Cyanophyllite
(Cu,Al)
 
3
[(OH)
 
6
|Sb
5+
 
(OH)
 
6
]
Related Minerals - Hey's Index Grouping:
18.1.1Lithiotantite
Li(Ta,Nb)
 
3
O
 
8
18.1.2Lueshite
NaNbO
 
3
18.1.3Natroniobite
NaNbO
 
3
18.1.4Franconite
Na
 
2
Nb
 
4
O
 
11
·9H
 
2
O
18.1.5Natrotantite
Na
 
2
Ta
 
4
O
 
11
18.1.6Irtyshite
Na
 
2
(Ta,Nb)
 
4
O
 
11
18.1.7Rankamaite
(Na,K,Pb,Li)
 
3
(Ta,Nb,Al)
 
11
(O,OH)
 
30
18.1.8Kalipyrochlore
(K,Sr)
 
2-x
Nb
 
2
O
 
6
(O,OH)·nH
 
2
O
18.1.9Calciotantite
CaTa
 
4
O
 
11
18.1.10Rynersonite
Ca(Ta,Nb)
 
2
O
 
6
18.1.11Microlite
(Ca,Na)
 
2
Ta
 
2
O
 
6
(O,OH,F)
18.1.12Belyankinite
Ca
 
1-2
(Ti,Zr,Nb)
 
5
O
 
12
 · 9H
 
2
O (?)
18.1.13Latrappite
(Ca,Na)(Nb,Ti,Fe)O
 
3
18.1.15Bariomicrolite
Ba(Ta,Nb)
 
2
(O,OH)
 
7
18.1.16Parabariomicrolite
BaTa
 
4
O
 
10
(OH)
 
2
·2H
 
2
O
18.1.17Bariopyrochlore
(Ba,Sr)
 
2
(Nb,Ti)
 
2
(O,OH)
 
7
18.1.18Alumotantite
AlTaO
 
4
18.1.19Simpsonite
Al
 
4
(Ta,Nb)
 
3
O
 
13
(OH,F)
18.1.20Sosedkoite
(K,Na)
 
5
Al
 
2
(Ta,Nb)
 
22
O
 
60
18.1.21Thoreaulite
SnTa
 
2
O
 
6
18.1.22Stannomicrolite
(Sn,Fe,Mn)
 
2
(Ta,Nb,Sn)
 
2
(O,OH)
 
7
18.1.23Foordite
(Sn,Pb)(Nb,Ta)
 
2
O
 
6
18.1.24Changbaiite
PbNb
 
2
O
 
6
18.1.25Plumbopyrochlore
(Pb,Y,U,Ca)
 
2-x
Nb
 
2
O
 
6
(OH)
18.1.26Plumbomicrolite
(Pb,Ca,U)
 
2
Ta
 
2
O
 
6
(OH)
18.1.27Stibiocolumbite
Sb(Nb,Ta)O
 
4
18.1.28Stibiotantalite
Sb(Ta,Nb)O
 
4
18.1.29Natrobistantite
(Na,Cs)Bi(Ta,Nb,Sb)
 
4
O
 
12
18.1.30Cesplumtantite
(Cs,Na)
 
2
(Pb,Sb
3+
 
)
 
3
Ta
 
8
O
 
24
18.1.31Stibiomicrolite
(Sb,Ca,Na)
 
2
(Ta,Nb)
 
2
O
 
7
18.1.32Cesstibtantite
(Cs,Na)SbTa
 
4
O
 
12
18.1.33 Stibobetafite
(Ca,Sb)
 
2
(Ti,Nb,Ta)
 
2
(O,OH)
 
7
18.1.34Bismutotantalite
Bi(Ta,Nb)O
 
4
18.1.35Bismutomicrolite
(Bi,Ca)(Ta,Nb)
 
2
O
 
6
(OH)
18.1.36Tantalite-(Mn)
MnTa
 
2
O
 
6
18.1.37Gerasimovskite
(Mn,Ca)(Nb,Ti)
 
5
O
 
12
·9H
 
2
O
18.1.38Tapiolite-(Mn)
(Mn,Fe)(Ta,Nb)
 
2
O
 
6
18.1.39Columbite-(Mn)
(Mn,Fe)(Nb,Ta)
 
2
O
 
6
18.1.40Wodginite
Mn(Sn,Ta)Ta
 
2
O
 
8
18.1.41Ixiolite
(Ta,Nb,Sn,Fe,Mn)
 
4
O
 
8
18.1.42Columbite-(Fe)
FeNb
 
2
O
 
6
18.1.43Tantalite-(Fe)
FeTa
 
2
O
 
6
18.1.44Columbite
(Fe,Mn)(Nb,Ta)
 
2
O
 
6
18.1.45Tantalite
(Fe,Mn)(Ta,Nb)
 
2
O
 
6
18.1.46Tapiolite
(Fe,Mn)(Ta,Nb)
 
2
O
 
6
18.1.47Tapiolite-(Fe)
(Fe,Mn)(Ta,Nb)
 
2
O
 
6
18.1.48Columbite-(Mg)
(Mg,Fe,Mn)(Nb,Ta)
 
2
O
 
6
18.1.50Strüverite
(Ti,Ta,Fe)O
 
2
18.1.51 Staringite
(Fe,Mn)
 
x
(Ta,Nb)
 
2x
Sn
 
6-3x
O
 
12

Other Names for Hochelagaite

Synonyms:
IMA1983-088
German names:
Hochelagait
Spanish names:
Hochelagaita

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 Hochelagaite

Reference List:American Mineralogist: 72: 1024.

Internet Links for Hochelagaite

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    Localities for Hochelagaite

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    The 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.
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    (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.
    Canada
     
    • Québec
      • Jacques Cartier Co.
        • Montréal
          • St. Michel District
    		Jambor et al. (1986) Canadian Mineralogist: 24: 449-453.
      • Rouville Co.
        • Mont Saint-Hilaire
    		Jambor et al. (1986) Can.Min. 24, 449-453., Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.
      • Verchères Co.
        • Varennes & St-Amable
          • Saint-Amable sill
    		Mineralogical Record: 29: 83.
    Norway
     
    • Vestfold
      • Larvik
        • Vardaasen
    		Collection of Peter Andresen.
    Peter Andresen, 2005.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
    		Min Rec (2006) 37: 5-60
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