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Krinovite

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Formula:
Na
 
2
Mg
 
4
Cr
3+
2
(Si
 
6
O
 
18
)O
 
2
System:TriclinicColour:Emerald green
Hardness:5½ - 7
Member of:Aenigmatite Group > Sapphirine Supergroup
This page provides mineralogical data about Krinovite.

Classification of Krinovite

IMA status:Approved 1967
Strunz 8th edition ID:8/F.14-10
Nickel-Strunz 10th (pending) edition ID:9.DH.40

9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12
Dana 8th edition ID:69.2.1a.4

69 : INOSILICATES Chains with Side Branches or Loops
2 : Chains with Side Branches or Loops with P>2
Hey's CIM Ref.:14.15.4

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

Type Locality:Canyon Diablo meteorite, Meteor Crater and vicinity, Winslow, Coconino Co., Arizona, USA
Year of Discovery:1967

Physical Properties of Krinovite

Lustre:Sub-Adamantine
Colour:Emerald green
Streak:Greenish white
Hardness (Mohs):5½ - 7
Cleavage:None Observed

Crystallography of Krinovite

Crystal System:Triclinic
Cell Parameters:a = 10.23Å, b = 10.64Å, c = 8.78Å
α = 105.15°, β = 96.5°, γ = 125.15°
Ratio:a:b:c = 0.961 : 1 : 0.825
Unit Cell Volume:V 710.91 ų (Calculated from Unit Cell)

Optical Data of Krinovite

Type:Biaxial (+)
RI values: nα = 1.712 nβ = 1.725 nγ = 1.760
2V:Measured: 61° , Calculated: 64°
Maximum Birefringence:δ = 0.048

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

Chemical Properties of Krinovite

Formula:
Na
 
2
Mg
 
4
Cr
3+
2
(Si
 
6
O
 
18
)O
 
2
Essential elements:Cr, Mg, Na, O, Si
All elements listed in formula:Cr, Mg, Na, O, Si
Common Impurities:Ti,Al,Fe,Mn,Ca,K

Relationship of Krinovite to other Species

Member of:Aenigmatite Group > Sapphirine Supergroup
Other Members of Group:

- +
Aenigmatite
Na
 
2
Fe
2+
5
Ti(Si
 
6
O
 
18
)O
 
2
Wilkinsonite
Na
 
2
Fe
2+
4
Fe
3+
2
(Si
 
6
O
 
18
)O
 
2
Related Minerals - Nickel-Strunz Grouping):

- +
9.DH.05Leucophanite
NaCaBeSi
 
2
O
 
6
F
9.DH.10Ohmilite
Sr
 
3
(Ti,Fe
3+
 
)(Si
 
4
O
 
12
)(O,OH) · 2-3H
 
2
O
9.DH.15Haradaite
SrVSi
 
2
O
 
7
9.DH.15Suzukiite
BaVSi
 
2
O
 
7
9.DH.20Batisite
BaNaNaTi
 
2
(Si
 
4
O
 
12
)O
 
2
9.DH.20Shcherbakovite
(K,Ba)KNa(Ti,Nb)
 
2
(Si
 
4
O
 
12
)O
 
2
9.DH.25Taikanite
Sr
 
3
BaMn
2+
2
(Si
 
4
O
 
12
)O
 
2
9.DH.30Krauskopfite
BaSi
 
2
O
 
5
 · 3H
 
2
O
9.DH.35Balangeroite
(Mg,Fe
2+
 
,Fe
3+
 
,Mn
2+
 
)
 
42
Si
 
16
O
 
54
(OH)
 
40
9.DH.35Gageite
Mn
 
21
O
 
3
(Si
 
4
O
 
12
)
 
2
(OH)
 
20
9.DH.40Aenigmatite
Na
 
2
Fe
2+
5
Ti(Si
 
6
O
 
18
)O
 
2
9.DH.40Dorrite
Ca
 
2
(Mg,Fe
2+
 
)
 
2
Fe
3+
4
[O
 
2
|Al
 
4
Si
 
2
O
 
18
]
9.DH.40Høgtuvaite
(Ca,Na)
 
2
(Fe
2+
 
,Fe
3+
 
,Ti)
 
6
[O
 
2
|Be(Si,Al)
 
5
O
 
18
]
9.DH.40Makarochkinite
Ca
 
2
Fe
2+
4
Fe
3+
 
Ti[O
 
2
|BeAlSi
 
4
O
 
18
]
9.DH.40Rhönite
Ca
 
2
(Mg,Fe
2+
 
,Fe
3+
 
,Ti)
 
6
[O
 
2
|(Si,Al)
 
6
O
 
18
]
9.DH.40Serendibite
(Ca,Na)
 
2
(Mg,Fe
2+
 
)
 
3
(Al,Fe
3+
 
)
 
3
[O
 
2
|(Si,Al,B)
 
6
O
 
18
]
9.DH.40Welshite
Ca
 
4
Mg
 
9
Sb
 
3
O
 
4
[Si
 
6
Be
 
3
AlFe
 
2
O
 
36
]
9.DH.40Wilkinsonite
Na
 
2
Fe
2+
4
Fe
3+
2
(Si
 
6
O
 
18
)O
 
2
9.DH.45Sapphirine
(Mg,Fe)
 
4-x
Al
 
4+x
[Al
 
4+x
Si
 
2-x
O
 
18
]O
 
2
9.DH.50Khmaralite
(Mg,Al,Fe)
 
16
[(Al,Si,Be)
 
12
O
 
36
]O
 
4
9.DH.55Surinamite
(Mg,Fe)
 
3
Al
 
4
BeSi
 
3
O
 
16
9.DH.60Deerite
(Fe,Mn)
 
6
(Fe,Al)
 
3
[Si
 
6
O
 
17
]O
 
3
(OH)
 
5
9.DH.65Howieite
Na(Fe,Mn)
 
10
(Fe,Al)
 
2
Si
 
12
O
 
31
(OH)
 
13
9.DH.65Taneyamalite
(Na,Ca)(Mn,Mg,Fe)
 
12
Si
 
12
(O,OH)
 
44
9.DH.70Johninnesite
Na
 
2
Mn
2+
9
Mg
 
7
(OH)
 
8
[AsO
 
4
]
 
2
[Si
 
6
O
 
17
]
 
2
9.DH.75Agrellite
NaCa
 
2
Si
 
4
O
 
10
F
Related Minerals - Hey's Index Grouping:

- +
14.15.1Kosmochlor
NaCrSi
 
2
O
 
6
14.15.2Natalyite
Na(V
3+
 
,Cr)Si
 
2
O
 
6
14.15.3Knorringite
Mg
 
3
Cr
 
2
(SiO
 
4
)
 
3
14.15.5Uvarovite
Ca
 
3
Cr
 
2
(SiO
 
4
)
 
3

Other Names for Krinovite

Synonyms:
IMA1967-016
Other Languages:
German:Krinovit
Russian:Криновит
Spanish:Krinovita

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 Krinovite

Reference List:

- +
American Mineralogist (1969): 54: 578.

Zeitschrift für Kristallographie (1989): 187: 133-138.

Internet Links for Krinovite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Krinovite details from Handbook of Mineralogy (PDF)
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    • Localities for Krinovite

    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.
    USA
     
    • Arizona
      • Coconino Co.
        • Winslow
          • Meteor Crater and vicinity
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 171-172, 269, 356; Olsen, E. & L. Fuchs (1968), Krinovite, NaMg2CrSi3O10 = a new meteorite mineral, Science 161: 786-787; HB2/1 (1995); Eur.Jour.Min.: 11 (1999): 743.
    • Texas
      • Wichita Co.
    		http://rruff.geo.arizona.edu/doclib/hom/krinovite.pdf.
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