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Jervisite

Big Photo

Seula mine (ex Montecatini quarry), Mount Camoscio, Oltrefiume, Baveno, Verbano-Cusio-Ossola Province, Piedmont, Italy
© G.Fraccaro

Show Jervisite Photos (5)
Formula:
(Na,Ca,Fe
2+
 
)(Sc,Mg,Fe
2+
 
)[Si
 
2
O
 
6
]
System:MonoclinicColour:light green
Hardness:6
Name:Named in honour of William P. Jervis, Curator of the Museo Industriale Italiano di Torino, Torino, Italy.


Pyroxene Group - Clinopyroxene Subgroup.

Classification of Jervisite

IMA status:Approved
Strunz 8th edition ID:8/F.01-150
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.6

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
Hey's CIM Ref.:14.8.12

14 : Silicates not Containing Aluminum
8 : Silicates of Group III metals other than Al
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Type Occurrence of Jervisite

Type Locality:Diverio quarry, Omegna, Verbano-Cusio-Ossola Province, Piedmont, Italy
Year of Discovery:1982

Physical Properties of Jervisite

Colour:light green
Streak:white
Hardness (Mohs):6
Cleavage:Perfect

Crystallography of Jervisite

Crystal System:Monoclinic
Cell Parameters:a = 9.85Å, b = 9.04Å, c = 5.31Å
β = 106.62°
Ratio:a:b:c = 1.09 : 1 : 0.587
Unit Cell Volume:V 453.07 ų (Calculated from Unit Cell)

Optical Data of Jervisite

Type:Biaxial (-)
RI values: nα = 1.683 nβ = 1.715 nγ = 1.724
Maximum Birefringence:δ = 0.041

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

Chemical Properties of Jervisite

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

Relationship of Jervisite to other Species

Member of Group:
Clinopyroxene Subgroup:
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.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.15Davisite
CaScAlSiO
 
6
9.DA.15Kushiroite
CaAl[AlSiO
 
6
]
9.DA.15Grossmanite
CaTi
3+
 
 AlSiO
 
6
9.DA.20Aegirine-augite
(Na,Ca)(Fe
3+
 
,Fe
2+
 
,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.25Kosmochlor
NaCr[Si
 
2
O
 
6
]
9.DA.25Namansilite
NaMn
3+
 
[Si
 
2
O
 
6
]
9.DA.25Natalyite
Na(V
3+
 
,Cr)[Si
 
2
O
 
6
]
9.DA.30Spodumene
LiAl[Si
 
2
O
 
6
]
Related Minerals - Hey's Index Grouping:

- +
14.8.1Thalénite-(Y)
Y
 
3
Si
 
3
O
 
10
(OH)
14.8.2Keiviite-(Y)
(Y,Yb)
 
2
[Si
 
2
O
 
7
]
14.8.3Keiviite-(Yb)
(Yb,Y)
 
2
[Si
 
2
O
 
7
]
14.8.4Tombarthite-(Y)
Y
 
4
[HSiO
 
4
]
 
3
14.8.5Thortveitite
(Sc,Y)
 
2
[Si
 
2
O
 
7
]
14.8.6Sazhinite-(Ce)
Na
 
3
Ce[Si
 
6
O
 
15
] · 6H
 
2
O
14.8.7Monteregianite-(Y)
(Na,K)
 
6
(Y,Ca)
 
2
Si
 
16
O
 
38
·10H
 
2
O
14.8.8Iraqite-(La)
K(Ca,Na)
 
2
(La,Ce,Th)[(Si,Al)
 
8
O
 
20
]
14.8.9Ashcroftine-(Y)
K
 
5
Na
 
5
(Y,Ca)
 
12
Si
 
28
O
 
70
(OH)
 
2
(CO
 
3
)
 
8
·8H
 
2
O
14.8.10Nordite-(La)
(La,Ce)(Sr,Ca)Na
 
2
(Na,Mn)(Zn,Mg)Si
 
6
O
 
17
14.8.11Nordite-(Ce)
(Ce,La)(Sr,Ca)Na
 
2
(Na,Mn)(Zn,Mg)Si
 
6
O
 
17
14.8.13Cerite-(Ce)
(Ce,Ca)
 
9
(Fe,Mg)(SiO
 
4
)
 
3
[SiO
 
3
(OH)]
 
4
(OH)
 
3
14.8.14Cascandite
Ca(Sc,Fe
3+
 
)[HSi
 
3
O
 
9
]

Other Names for Jervisite

Other Languages:
German:Jervisit
Spanish:Jervisita

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 Jervisite

Reference List:Ito, J. & Frondel, C. (1968). Am. Mineral. 53, 1276-1280.

Clark, J.R., D.E. Appleman, and J.J. Papike (1969) Crystal-chemical characterization of clinopyroxenes based on eight new structure refinements. MSA Special Paper 2: 31-50.

Acta Crystallographica: B29 (1973) 2615-2616.

American Mineralogist (1982): 67: 599-603.

Acta Crystallographica C50 (1994) 838-840.

Merlino, S. & Orlandi, P. (2006): Jervisite, NaScSi2O6: a new occurrence, chemical data and crystal structure. Periodico di Mineralogia, 75, 201-220.

Internet Links for Jervisite

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    Localities for Jervisite

    (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)
    Italy
     
    • Piedmont
      • Verbano-Cusio-Ossola Province
        • Baveno
          • Oltrefiume
            • Mount Camoscio
    		Mellini M., Merlino S., Orlandi P., Rinaldi R.(1982): Cascandite and jervisite, two new scandium silicates from Baveno, Italy. Am. Mineral., 67, 599-603. and Min. Rec. 14 (3), 157-168; Merlino, S. & Orlandi, P. (2006): Jervisite, NaScSi2O6: a new occurrence, chemical data and crystal structure. Periodico di Mineralogia, 75, 201-220.
        • Omegna
          • Agrano
    		Lapis, 13 (9), 29-33+42.
    Mellini, M., Merlino, S., Orlandi, P., Rinaldi, R. (1982): Cascandite and jervisite, two new scandium silicates from Baveno, Italy. American Mineralogist, 67, 599-603.
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 15th Nov 2009 11:52:35