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Natalyite

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Sludyanka (Slyudyanka), Baikal area, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia
© Knut Eldjarn

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Formula:
Na(V
3+
 
,Cr)[Si
 
2
O
 
6
]
System:MonoclinicColour:yellow-green, light green
Hardness:6½


Pyroxene Group - Clinopyroxene Subgroup.

Classification of Natalyite

IMA status:Approved 1984
Strunz 8th edition ID:8/F.01-160
Nickel-Strunz 10th (pending) edition ID:9.DA.25

9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
Dana 8th edition ID:65.1.3c.5

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
Hey's CIM Ref.:14.15.2

14 : Silicates not Containing Aluminum
15 : Silicates of Cr
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Type Occurrence of Natalyite

Type Locality:Pereval Marble Quarry, Sludyanka (Slyudyanka), Baikal area, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia
Year of Discovery:1985

Physical Properties of Natalyite

Colour:yellow-green, light green
Streak:green
Hardness (Mohs):6½
Cleavage:Distinct/Good

Crystallography of Natalyite

Crystal System:Monoclinic
Cell Parameters:a = 9.64Å, b = 8.75Å, c = 5.29Å
β = 107.02°
Ratio:a:b:c = 1.102 : 1 : 0.605
Unit Cell Volume:V 426.67 ų (Calculated from Unit Cell)

Optical Data of Natalyite

Type:Biaxial (-)
RI values: nα = 1.741 nβ = 1.762 nγ = 1.762
2V:Measured: 8° to 12°
Maximum Birefringence:δ = 0.021

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

Chemical Properties of Natalyite

Formula:
Na(V
3+
 
,Cr)[Si
 
2
O
 
6
]
Essential elements:Na, O, Si, V
All elements listed in formula:Cr, Na, O, Si, V
Common Impurities:Ti,Al,Mg,Ca

Relationship of Natalyite to other Species

Related Minerals - Nickel-Strunz Grouping):
9.DA.05Donpeacorite
(Mn
2+
 
,Mg)Mg[SiO
 
3
]
 
2
9.DA.05Enstatite
Mg
 
2
[SiO
 
3
]
 
2
9.DA.05Ferrosilite
Fe
 
2
[SiO
 
3
]
 
2
9.DA.05Akimotoite
(Mg,Fe
2+
 
)SiO
 
3
9.DA.10Clinoenstatite
Mg
 
2
[Si
 
2
O
 
6
]
9.DA.10Clinoferrosilite
Fe
2+
 
(Fe
2+
 
,Mg)[Si
 
2
O
 
6
]
9.DA.10Kanoite
Mn
2+
 
(Mg,Mn
2+
 
)[Si
 
2
O
 
6
]
9.DA.10Pigeonite
(Mg,Fe
2+
 
,Ca)(Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
9.DA.15Augite
(Ca,Na)(Mg,Fe
2+
 
,Al,Fe
3+
 
,Ti)[(Si,Al)
 
2
O
 
6
]
9.DA.15Diopside
CaMg[Si
 
2
O
 
6
]
9.DA.15Esseneite
CaFe
3+
 
[AlSiO
 
6
]
9.DA.15Hedenbergite
CaFe
2+
 
[Si
 
2
O
 
6
]
9.DA.15Johannsenite
CaMn
2+
 
[Si
 
2
O
 
6
]
9.DA.15Petedunnite
Ca(Zn,Mn
2+
 
,Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
9.DA.20Aegirine-augite
(Na,Ca)(Fe,Fe,Mg,Al)Si
 
2
O
 
6
9.DA.20Omphacite
(Ca,Na)(Mg,Al)[Si
 
2
O
 
6
]
9.DA.25Aegirine
NaFe
3+
 
[Si
 
2
O
 
6
]
9.DA.25Jadeite
Na(Al,Fe
3+
 
)[Si
 
2
O
 
6
]
9.DA.25Jervisite
(Na,Ca,Fe
2+
 
)(Sc,Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
9.DA.25Kosmochlor
NaCr[Si
 
2
O
 
6
]
9.DA.25Namansilite
NaMn
3+
 
[Si
 
2
O
 
6
]
9.DA.30Spodumene
LiAl[Si
 
2
O
 
6
]
Related Minerals - Hey's Index Grouping:
14.15.1Kosmochlor
NaCr[Si
 
2
O
 
6
]
14.15.3Knorringite
Mg
 
3
Cr
 
2
[SiO
 
4
]
 
3
14.15.4Krinovite
Na
 
2
Mg
 
4
Cr
3+
2
[O
 
2
|Si
 
6
O
 
18
]
14.15.5Uvarovite
Ca
 
3
Cr
 
2
[SiO
 
4
]
 
3

Other Names for Natalyite

Synonyms:
IMA1984-053
German names:
Natalyit
Spanish names:
Natalyita

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 Natalyite

Reference List:Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva (1994): 123: 55.

American Mineralogist (1987): 72: 223-224.

Internet Links for Natalyite

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  • Raman and XRD data at RRUFF project
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    Localities for Natalyite

    (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
     
    • Ontario
      • Thunder Bay District
        • Marathon
    		Potter & Mitchel (2005)
    Russia
     
    • Eastern-Siberian Region
      • Transbaikalia (Zabaykalye)
        • Buriatia (Buryatia) Republic
          • Baikal area
            • Sludyanka (Slyudyanka)
    		ZVMO,(1985) 114, 630-635
    • Northern Region
      • Karelia Republic
          • Lake Onega area
    		P.M. Kartashov data
    Mineral and/or Locality
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