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Chromio-pargasite

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Chromio-pargasite

Akaishi mine, Doi, Shikokuchuo City, Ehime Prefecture, Shikoku Island, Japan
Chromio-pargasite

Higashi-Akaishi dunite, Ehime prefecture, Shikoku Island, Japan
Chromio-pargasite

Higashi-Akaishi dunite, Ehime prefecture, Shikoku Island, Japan
Chromio-pargasite

Akaishi mine, Doi, Shikokuchuo City, Ehime Prefecture, Shikoku Island, Japan
Chromio-pargasite

Higashi-Akaishi dunite, Ehime prefecture, Shikoku Island, Japan
Chromio-pargasite

Higashi-Akaishi dunite, Ehime prefecture, Shikoku Island, Japan
Chromio-pargasite

Akaishi mine, Doi, Shikokuchuo City, Ehime Prefecture, Shikoku Island, Japan
Chromio-pargasite

Higashi-Akaishi dunite, Ehime prefecture, Shikoku Island, Japan
Formula:
NaCa2(Mg4Cr)(Si6Al2)O22(OH)2
System:
Monoclinic
Colour:
Emerald green to pale ...
Lustre:
Vitreous
Hardness:
6
Name:
Originally named after the locality where it was found in the Ehime Prefecture, Japan.
This mineral was originally named Ehimeite in the original description and the 2011 IMA approval of the species. It has been renamed Chromio-pargasite in the 2012 amphibole nomenclature in order to create a consistant naming convention for the pargasite group minerals.


Classification of Chromio-pargasite

IMA status:
Approved
Approval Year:
2011
Nickel-Strunz 10th (pending) ed.:
9.DE.15

9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si4O11; Clinoamphiboles

Physical Properties of Chromio-pargasite

Lustre:
Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Emerald green to pale green
Streak:
Pale green
Hardness (Mohs):
6
Tenacity:
Brittle
Cleavage:
Perfect
on {110}
Fracture:
Irregular/Uneven
Density:
3.08(3) g/cm3 (Measured)    3.121 g/cm3 (Calculated)

Optical Data of Chromio-pargasite

Type:
Biaxial (+)
RI values:
nα = 1.644(2) nβ = 1.647(2) nγ = 1.659(2)
2V:
Calculated: 53°
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Visible
Comments:
Yellowish green to bluish green.

Chemical Properties of Chromio-pargasite

IMA Formula:
NaCa2(Mg4Cr)(Si6Al2)O22(OH)2
Mindat.org Formula:
{Na}{Ca2}{Mg4Cr3+}(Al2Si6O22)(OH)2

Chromio-Pargasite is defined as a pargasite group member with the following dominant elements:
A position: Na
C position: Mg as the dominant divalent cation and Cr as the dominant trivalent cation.
W position: (OH) as the dominant anion
Elements listed in formula:
Al, Ca, Cr, H, Mg, Na, O, Si - search for minerals with similar chemistry
Analytical Data:
Average of EDS analyses; water content from the stoichiometry. Sample from the type locality.
SiO2 (42.90)
TiO2 (0.25)
Al2O3 (12.10)
Cr2O3 (5.46)
FeO (1.20)
MgO (19.28)
CaO (12.31)
Na2O (3.26)
K2O (0.37)
H2O (2.09)
Total (99.22)
Common Impurities:
Ti,Fe,K

Crystallography of Chromio-pargasite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Space Group Setting:
C1 2/m 1
Cell Parameters:
a = 9.9176(14) Å, b = 18.0009(12) Å, c = 5.2850(7) Å
β = 105.400(7)°
Ratio:
a:b:c = 0.551 : 1 : 0.294
Unit Cell Volume:
V 909.6 ų
Z:
2
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.3694 (58)
2.9319 (43)
2.6971 (81)
2.5853 (50)
2.5462 (100)
2.3461 (42)
1.5140 (55)

Type Occurrence of Chromio-pargasite

Type Locality:
Akaishi mine, Doi, Shikokuchuo City, Ehime Prefecture, Shikoku Island, Japan
General Appearance of Type Material:
Up to 1,5 cm long, emerald green, prismatic crystals
Place of Conservation of Type Material:
National museum of nature and science, Tokyo, Japan
Geological Setting of Type Material:
Chromio-pargasite is believed to have formed by reaction between chromite and metmorphic fluid in the retrogade stage of serpentinization of a dunite body metamorphosed to eclogite facies.
Empirical Formula:
(Na0.88K0.07)(Ca1.89Na0.02Mg0.09)(Mg4.03Cr0.62Al0.19Fe3+0.07Fe2+0.07Ti0.03)(Si6.14Al1.86)O22(OH)2

Relationship of Chromio-pargasite to other Species

Member of:
Pargasite Root Name Group > Calcium Amphibole Subgroup > w(OH, F, Cl)-dominant Amphibole Group
Other Members of Group:
Ferro-chloro-pargasiteNaCa2(Fe42+Al)(Al2Si6O22)Cl2
Ferro-fluoro-pargasite(Na)(Ca2)(Fe42+Al)(Al2Si6O22)F2
Ferro-pargasite{Na}{Ca2}{Fe42+Al}(Al2Si6O22)(OH)2
Fluoro-pargasite{Na}{Ca2}{Mg4Al}(Al2Si6O22)(F,OH)2
Pargasite{Na}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
Potassic-chloro-pargasite{K}{Ca2}{Mg4Al}(Al2Si6O22)(Cl,OH)2
Potassic-ferro-pargasite{K}{Ca2}{Fe42+Al}(Al2Si6O22)(OH)2
Potassic-fluoro-pargasite{K}{Ca2}{Mg4Al}(Al2Si6O22)F2
Potassic-pargasite{K}{Ca2}{Mg4Al}(Al2Si6O22)(OH)2
Related Minerals - Nickel-Strunz Grouping):
9.DE.05Anthophyllite◻Mg2Mg5Si8O22(OH)2
9.DE.05Cummingtonite◻Mg2Mg5Si8O22(OH)2
9.DE.05Clino-holmquistite Root Name☐{Li2}{Z32+Z23+}(Si8O22)(OH,F,Cl)2
9.DE.05Grunerite◻Fe22+Fe52+Si8O22(OH)2
9.DE.05Manganocummingtonite◻Mn2Mg5Si8O22(OH)2
9.DE.05Manganogrunerite◻Mn2Fe52+Si8O22(OH)2
9.DE.05Permanganogrunerite☐{Mn22+}{Mn52+}(Si8O22)(OH)2
9.DE.05Ferro-fluoro-pedrizite{Na}{Li2}{Fe2Al2Li}(Al2Si6O22)F2
9.DE.05Ferri-fluoro-leakeiteNaNa2(Mg2Fe23+Li)Si8O22F2
9.DE.10ActinoliteCa2(Mg4.5-2.5Fe2+0.5-2.5)Σ=5Si8O22(OH)2
9.DE.10Ferri-tschermakite☐{Ca2}{Mg3Fe23+}(Al2Si6O22)(OH)2
9.DE.10Ferro-actinolite◻Ca2Mg2.5-0Fe2+2.5-5Si8O22(OH)2
9.DE.10Ferro-hornblendeCa2Fe42+Al(Si7Al)O22(OH)2
9.DE.10Ferro-tschermakite☐{Ca2}{Fe32+Al2}(Al2Si6O22)(OH)2
9.DE.10JoesmithitePbCa2Mg3Fe23+(Si6Be2)O22(OH)2
9.DE.10Magnesio-hornblendeCa2(Mg4Al)(Si7Al)O22(OH)2
9.DE.10Tremolite◻Ca2Mg5Si8O22(OH)2
9.DE.10Tschermakite◻Ca2(Mg3Al2)(Si6Al2)O22(OH)2
9.DE.10CannilloiteCa(Ca2)(Mg4Al)(Al3Si5O22)(OH)2
9.DE.10Fluoro-cannilloiteCaCa2(Mg4Al)(Si5Al3)O22F2
9.DE.10Parvo-manganotremolite☐{CaMn2+}{Mg5}(Si8O22)(OH)2
9.DE.10Fluoro-tremolite◻Ca2Mg5Si8O22F2
9.DE.10Potassic-fluoro-pargasiteKCa2(Mg4Al)Si6Al2O22F2
9.DE.15EdeniteNaCa2Mg5(Si7Al)O22(OH)2
9.DE.15Ferro-edeniteNaCa2Fe52+(Si7Al)O22(OH)2
9.DE.15Ferro-kaersutite{Na}{Ca2}{Fe32+AlTi}(Al2Si6O22)O2
9.DE.15Ferro-pargasiteNaCa2(Fe42+Al)(Si6Al2)O22(OH)2
9.DE.15HastingsiteNaCa2(Fe42+Fe3+)(Si6Al2)O22(OH)2
9.DE.15KaersutiteNaCa2(Mg3Ti4+Al)(Si6Al2)O22O2
9.DE.15Magnesio-hastingsiteNaCa2(Mg4Fe3+)Si6Al2O22(OH)2
9.DE.15PargasiteNaCa2(Mg4Al)(Si6Al2)O22(OH)2
9.DE.15SadanagaiteNaCa2(Mg3Al2)(Si5Al3)O22(OH)2
9.DE.15Fluoro-edeniteNaCa2Mg5(Si7Al)O22F2
9.DE.15Potassic-ferro-ferri-sadanagaiteKCa2(Fe32+Fe23+)(Si5Al3)O22(OH)2
9.DE.15Potassic-sadanagaiteKCa2Mg3Al2(Si5Al3)O22(OH)2
9.DE.15Potassic-pargasiteKCa2(Mg4Al)(Si6Al2)O22(OH)2
9.DE.15Potassic-ferro-sadanagaiteKCa2(Fe32+Al2)(Si5Al3)O22(OH)2
9.DE.15Magnesio-fluoro-hastingsiteNaCa2(Mg4Fe3+)(Si6Al2)O22F2
9.DE.15Potassic-fluoro-hastingsiteKCa2(Fe42+Fe3+)(Si6Al2)O22F2
9.DE.15Potassic-chloro-hastingsiteKCa2[Fe42+Fe3+](Si6Al2)O22Cl2
9.DE.15Fluoro-pargasiteNaCa2(Mg4Al)(Si6Al2)O22F2
9.DE.15Parvo-mangano-edenite{Na}{CaMn2+}{Mg5}(AlSi7O22)(OH)2
9.DE.15Potassic-chloro-pargasiteKCa2(Mg4Al)(Si6Al2)O22Cl2
9.DE.15Potassic-ferro-chloro-edenite{K}{Ca2}{Fe52+}(AlSi7O22)(Cl,OH)2
9.DE.15Potassic-magnesio-hastingsiteKCa2(Mg4Fe3+)(Si6Al2)O22(OH)2
9.DE.15Potassic-ferro-pargasiteKCa2(Fe42+Al)Si6Al2O22(OH)2
9.DE.20Ferro-taramiteNa(NaCa)Fe32+Al2(Si6Al2)O22(OH)2
9.DE.20Barroisite◻NaCa[Mg3Al2](Si7Al)O22(OH)2
9.DE.20Ferro-ferri-barroisite☐(CaNa)(Fe32+Fe23+)(AlSi7O22)(OH)2
9.DE.20Ferro-ferri-winchite☐[CaNa][Fe42+(Fe3+,Al)]Si8O22(OH)2
9.DE.20Ferri-barroisite☐(CaNa)(Mg3Fe23+)(AlSi7O22)(OH)2
9.DE.20Ferro-ferri-taramiteNa(CaNa)(Fe32+Fe23+)(Al2Si6O22)(OH)2
9.DE.20Ferro-ferri-katophoriteNa(NaCa)(Fe42+Fe3+)(Si7Al)O22(OH)2
9.DE.20Ferro-barroisite☐{CaNa}{Fe32+Al2}(AlSi7O22)(OH)2
9.DE.20Ferro-richteriteNa2CaFe52+Si8O22(OH)2
9.DE.20Ferro-winchite ☐{CaNa}{Fe42+Al}(Si8O22)(OH)2
9.DE.20Ferro-katophoriteNa2CaFe42+Al(Si7Al)O22(OH)2
9.DE.20Ferri-taramiteNa(CaNa)(Mg3Fe23+)(Al2Si6O22)(OH)2
9.DE.20Magnesiotaramite{Na}{CaNa}{Mg3AlFe3+}(Al2Si6O22)(OH)2
9.DE.20RichteriteNa2CaMg5Si8O22(OH)2
9.DE.20WinchiteNaCa(Mg4Al)Si8O22(OH)2
9.DE.20TaramiteNa2CaMg3Al2(Si6Al2)O22(OH)2
9.DE.20Fluoro-richteriteNa(NaCa)Mg5Si8O22F2
9.DE.20KatophoriteNaNaCa(Mg4Al)(Si7Al)O22(OH)2
9.DE.20Potassic-fluoro-richteriteK(NaCa)Mg5Si8O22F2
9.DE.20Potassic-richteriteK[CaNa][Mg5]Si8O22(OH)2
9.DE.20Ferri-ghoseite◻(NaMn2+)(Mg4Fe3+)Si8O22(OH)2
9.DE.20Ferri-winchite◻NaCa(Mg4Fe3+)Si8O22(OH)2
9.DE.20Fluoro-taramiteNa(NaCa)(Mg3Al2)(Si6Al2)O22F2
9.DE.25ArfvedsoniteNaNa2(Fe42+Fe3+)Si8O22(OH)2
9.DE.25EckermanniteNaNa2(Mg4Al)Si8O22(OH)2
9.DE.25Ferro-eckermanniteNaNa2(Fe42+Al)Si8O22(OH)2
9.DE.25Ferro-glaucophane◻Na2(Fe32+Al2)Si8O22(OH)2
9.DE.25Glaucophane◻Na2(Mg3Al2)Si8O22(OH)2
9.DE.25Potassic-mangani-leakeiteKNa2(Mg2Mn23+Li)Si8O22(OH)2
9.DE.25Mangano-ferri-eckermanniteNaNa2(Mn42+Fe3+)Si8O22(OH)2
9.DE.25Ferri-leakeiteNa(NaLi)(Mg2Fe23+Li)Si8O22(OH)2
9.DE.25Magnesio-riebeckite◻Na2(Mg3Fe23+)Si8O22(OH)2
9.DE.25Magnesio-arfvedsoniteNaNa2(Mg4Fe3+)Si8O22(OH)2
9.DE.25NybøiteNaNa2(Mg3Al2)(Si7Al)O22(OH)2
9.DE.25Riebeckite◻Na2(Fe32+Fe23+)Si8O22(OH)2
9.DE.25Mangano-mangani-ungarettiiteNaNa2(Mn22+Mn33+)Si8O22O2
9.DE.25Ferro-ferri-nybøiteNaNa2(Fe32+Fe23+)(Si7Al)O22(OH)2
9.DE.25Clino-ferro-ferri-holmquistite◻Li2(Fe32+Fe23+)Si8O22(OH)2
9.DE.25Ferri-nybøiteNaNa2(Mg3Fe23+](AlSi7O22)(OH)2
9.DE.25Ferro-ferri-leakeite[Na][Na2][Fe22+Fe23+Li]Si8O22(OH)2
9.DE.25Ferro-ferri-fluoro-leakeiteNaNa2(Fe22+Fe23+Li)Si8O22F2
9.DE.25Sodic-ferri-clinoferroholmquistiteNa0.5{Li2}{Fe32+Fe23+}(Si8O22)(OH)2
9.DE.25Magnesio-fluoro-arfvedsoniteNaNa2(Mg4Fe3+)Si8O22F2
9.DE.25Ferri-pedrizite[Na][Li2][Mg2Fe23+Li]Si8O22(OH)2
9.DE.25Potassic-ferri-leakeiteKNa2Mg2Fe23+LiSi8O22(OH)2
9.DE.25Fluoro-nybøiteNaNa2(Mg3Al2)(Si7Al)O22F2
9.DE.25Mangani-dellaventuraiteNaNa2(MgMn23+LiTi4+)Si8O22O2
9.DE.25Fluoro-pedriziteNaLi2(Mg2Al2Li)(Si8O22)F2
9.DE.25Potassic-arfvedsoniteKNa2Fe42+Fe3+Si8O22(OH)2
9.DE.25Mangani-obertiiteNaNa2(Mg3Mn3+Ti4+)Si8O22O2
9.DE.25Potassic-magnesio-fluoro-arfvedsoniteKNa2(Mg4Fe3+)Si8O22F2
9.DE.25Ferro-ferri-pedriziteNaLi2(LiFe22+Fe23+)Si8O22(OH)2
9.DE.25Potassic-magnesio-arfvedsoniteKNa2Mg4Fe3+Si8O22(OH)2
9.DE.25PedriziteNaLi2(LiMg2Al2)(Si8O22)(OH)2
9.DE.25Ferro-pedriziteNaLi2(Fe22+Al2Li)Si8O22(OH)2
9.DE.25Fluoro-leakeiteNaNa2(Mg2Al2Li)Si8O22F2
9.DE.25Ferro-ferri-obertiiteNaNa2(Fe32+Fe3+Ti)Si8O22O2

Other Names for Chromio-pargasite

Synonyms:

Ehimeite

IMA2011-023

Name in Other Languages:
Japanese:愛媛閃石

Other Information

Fluorescence in UV light:
Non-fluorescent.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Chromio-pargasite

Reference List:
Nishio-Hamane, D., Ohnishi, M., Minakawa, T., Yamaura, J., Saito, S., Kadota, R. (2012) Ehimeite, NaCa2Mg4CrSi6Al2O22(OH)2: the first Cr-dominant amphibole from the Akaishi Mine, Higashi-Akaishi Mountain, Ehime Prefecture, Japan. Journal of Mineralogical and Petrological Sciences: 107: 1-7.

Hawthorne, F.C., Oberti, R., Harlow, G.E., Maresch, W.V., Martin, R.F., Schumacher, J.C., Welch, M.D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist: 97: 2031-2048.

Internet Links for Chromio-pargasite

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    • Localities for Chromio-pargasite

    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.
    (TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
    Japan
     
    • Shikoku Island
      • Ehime prefecture
    		Nishio-Hamane, D., Ohnishi, M., Minakawa, T., Yamaura, J., Saito, S. & Kadota, R. (2012): Ehimeite, NaCa2Mg4CrSi6Al2O22(OH)2: the first Cr-dominant amphibole from the Akaishi Mine, Higashi-Akaishi Mountain, Ehime Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 107, 1-7.
        • Shikokuchuo City
          • Doi
    		Nishio-Hamane, D., Ohnishi, M., Minakawa, T., Yamaura, J., Saito, S. & Kadota, R. (2012) Ehimeite, NaCa2Mg4CrSi6Al2O22(OH)2: the first Cr-dominant amphibole from the Akaishi Mine, Higashi-Akaishi Mountain, Ehime Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 107, 1-7.
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