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Niigataite

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Formula:
{CaSr}{Al3}(Si2O7)(SiO4)O(OH)
Colour:
pale grey to yellowish green
Lustre:
Vitreous
Hardness:
5 - 5½
Specific Gravity:
3.63 (Calculated)
Crystal System:
Monoclinic
Name:
Named for Niigata prefecture, where the type locality is.
Clinozoisite Subgroup of the Epidote Group. Originally known as niigataite; renamed "Clinozoisite-(Sr)" by the Epidote Subcommittee of the CNMMN in 2006; reverted to Niigataite in 2015.


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Classification of NiigataiteHide

IMA status:
Approved
Approval Year:
2001
Strunz 8th ed.:
8/C.23-35
Nickel-Strunz 10th (pending) ed.:
9.BG.05

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination

Physical Properties of NiigataiteHide

Lustre:
Vitreous
Transparency:
Translucent
Colour:
pale grey to yellowish green
Streak:
white
Hardness:
5 - 5½ on Mohs scale
Hardness Data:
Measured
Tenacity:
Brittle
Cleavage:
Perfect
on {001}
Density:
3.63 g/cm3 (Calculated)

Chemical Properties of NiigataiteHide

Formula:
{CaSr}{Al3}(Si2O7)(SiO4)O(OH)
IMA Formula:
CaSrAl3[Si2O7][SiO4]O(OH)
Elements listed:
Al, Ca, H, O, Si, Sr - search for minerals with similar chemistry
Common Impurities:
Fe

Crystallography of NiigataiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 8.89 Å, b = 5.588 Å, c = 10.21 Å
β = 115.12°
Ratio:
a:b:c = 1.591 : 1 : 1.827
Unit Cell V:
459.23 ų (Calculated from Unit Cell)
Morphology:
anhedral grains

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.90 Å(100)
2.79 Å(50)
2.70 Å(25)

Type Occurrence of NiigataiteHide

Type Locality:
ⓘ Miyabana beach, Ōmi, Itoigawa City, Niigata Prefecture, Japan
General Appearance of Type Material:
Micro anhedral grains to 0.5 mm across, intimately intergrown with clinozoisite, diaspore and chlorite.
Place of Conservation of Type Material:
Fossa Magna Museum
Geological Setting of Type Material:
Prehnite-rich rodingite block derived from serpentinite melange. Unlike the other Sr-bearing silicates from this district, niigataite has not been found in the jadeitite boulders.
Associated Minerals at Type Locality:
PrehniteDiasporeClinozoisiteChlorite Group

Synonyms of NiigataiteHide

Other Language Names for NiigataiteHide

German:Niigatait
Japanese:新潟石
Simplified Chinese:锶斜黝帘石
Spanish:Niigataita
Traditional Chinese:鍶斜黝簾石

Relationship of Niigataite to other SpeciesHide

Member of:
Epidote Group > Epidote Supergroup
Other Members of this group:
Clinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Epidote-(Sr){CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon.
Mukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)Mon.
Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Piemontite-(Pb){CaPb}{Al2Mn3+}(Si2O7)(SiO4)O(OH) Mon. 2/m : P21/m
Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon.
Tweddillite{CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
Unnamed (Fe3+ analogue of piemontite-(Pb))CaPbFe3+AlMn3+(Si2O7)(SiO4)O(OH)
Unnamed (Fe3+-analogue of piemontite)CaCaFe3+AlMn3+(Si2O7)(SiO4)(OH,O)2
Unnamed (Ga analogue of epidote)CaCaAlAlGa(Si2O7)(SiO4)O(OH)
Unnamed (Ga-dominant member of the epidote group){Ca2}{Al2(Ga,Fe)}(Si2O7)(SiO4)O(OH)

Related Minerals - Nickel-Strunz GroupingHide

9.BG.MagnesiovesuvianiteCa19MgAl4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10](OH)(OH)9Tet. 4/m : P4/n
9.BG.AlumovesuvianiteCa19AlAl4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(OH)9Tet. 4/m : P4/n
9.BG.05bAllanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(La){CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(Y){CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05aClinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bDissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Dollaseite-(Ce){CaCe}{MgAlMg}(Si2O7)(SiO4)(OH)FMon. 2/m : P21/m
9.BG.05aEpidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05aHancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05Khristovite-(Ce){CaCe}{MgAlMn2+}(Si2O7)(SiO4)(OH)FMon. 2/m : P21/m
9.BG.05aMukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05aPiemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05bManganiandrosite-(La){Mn2+La}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon.
9.BG.05Tawmawite{Ca2}{(Al,Fe3+,Cr)3}(Si2O7)(SiO4)O(OH)
9.BG.05Tweddillite{CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bFerriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Manganiandrosite-(Ce){Mn2+Ce}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Dissakisite-(La){CaLa}{Al2Mg}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Vanadoandrosite-(Ce){Mn2+Ce}{V3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05Uedaite-(Ce){Mn2+Ce}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05aEpidote-(Sr){CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bAllanite-(Nd){CaNd}{Al2Fe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bFerriallanite-(La){CaLa}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.05bÅskagenite-(Nd){Mn2+Nd}{Al2Fe3+}(Si2O7)(SiO4)O2Mon. 2/m : P21/m
9.BG.9.BG.Ferriakasakaite-(La){CaLa}{Fe3+AlMn2+}(Si2O7)(SiO4)O(OH)Mon. 2/m : P21/m
9.BG.9.BG.Ferriandrosite-(Ce){Mn2+REE}{Fe3+AlMn2+}(SiO4)(Si2O7)O(OH)
9.BG.9.BGFerriperbøeite-(Ce)(CaCe3)(Fe3+Al2Fe2+)(Si2O7)(SiO4)3O(OH)2Mon. 2/m : P21/m
9.BG.10ZoisiteCa2Al3[Si2O7][SiO4]O(OH)Orth. mmm (2/m 2/m 2/m) : Pnma
9.BG.15MacfalliteCa2Mn3+3(SiO4)(Si2O7)(OH)3Mon.
9.BG.15SursassiteMn2+2Al3(SiO4)(Si2O7)(OH)3Mon. 2/m : P21/m
9.BG.20Julgoldite-(Fe2+)Ca2Fe2+Fe3+2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20OkhotskiteCa2Mn3+Mn3+2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20Pumpellyite-(Fe3+)Ca2Fe3+Al2(Si2O7)(SiO4)([OH]O) · H2OMon.
9.BG.20Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20Pumpellyite-(Mn2+)Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20ShuiskiteCa2MgCr3+2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.20Julgoldite-(Fe3+)Ca2Fe3+Fe3+2(Si2O7)(SiO4)([OH]O) · H2OMon.
9.BG.20Pumpellyite-(Al)Ca2AlAl2(Si2O7)(SiO4)([OH]O) · H2OMon.
9.BG.20PoppiiteCa2V3+V3+2(Si2O7)(SiO4)([OH]O) · H2OMon. 2/m : B2/m
9.BG.20Julgoldite-(Mg)Ca2MgFe3+2(Si2O7)(SiO4)(OH)2 · H2OMon.
9.BG.25GanomalitePb9Ca5Mn(Si2O7)4(SiO4)OHex.
9.BG.30RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2Mon.
9.BG.35VesuvianiteCa19Fe3+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35WiluiteCa19MgAl4(Al,Mg)8(B,☐)4☐[Si2O7]4[(SiO4)10]O(O,OH)9Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
9.BG.35ManganvesuvianiteCa19Mn3+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(OH)9Tet. 4/m : P4/n
9.BG.35FluorvesuvianiteCa19Fe3+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10]O(F,OH)9Tet. 4/mmm (4/m 2/m 2/m)
9.BG.35CyprineCa19Cu2+Al4(Al6Mg2)(☐4)☐[Si2O7]4[(SiO4)10](OH)(OH)9Tet. 4/m : P4/n
9.BG.40Vyuntspakhkite-(Y)(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7Mon.
9.BG.45DellaiteCa6Si3O11(OH)2Tric.
9.BG.50Gatelite-(Ce)CaCe3Al2(Al,Mg)(Mg,Fe2+,Al)(Si2O7)(SiO4)3(O,F)(OH,O)2Mon. 2/m : P21/b
9.BG.55Västmanlandite-(Ce)Ce3CaMg2Al2Si2O15(OH)2FMon. 2/m : P21/m

Fluorescence of NiigataiteHide

Other InformationHide

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 NiigataiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
H. Miyajima, S. Matsubara, R. Miyawaki, K. Hirokawa (2003): Niigataite, CaSrAl3(Si2O7)(SiO4)O(OH): Sr-analogue of clinozoisite, a new member of the epidote group from the Itoigawa-Ohmi district, Niigata Prefecture, central Japan. Journal of Mineralogy and Petrology Science, 98, 118-129.
American Mineralogist (2004): 89: 469. [Abstract].
www2.ocn.ne.jp/~miyajima/niigataite
www.city.itoigawa.niigata.jp/fmm
Revheim, O. & King, V.T. (2016): Epidote supergroup nomenclature: The names hancockite, niigataite and tweddillite reinstated. Mineralogical Magazine, 80, 877-880

Internet Links for NiigataiteHide

Localities for NiigataiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Japan
 
  • Niigata Prefecture
www-jm.eps.s.u-tokyo.ac.jp/2002cd-rom/pdf/j038/j038-003_e.pdf.; Miyajima H (2014) Jadeitite from Itoigawa, Niigata Prefecture, central Japan. 21 st meeting of the International Mineralogical Association. p 200
      • Ōmi
Miyajima et al. (2003) Journal of Mineralogical and Petrological Sciences, 98, 118-129.
  • Tottori Prefecture
    • Yazu district
Norimasa SHIMOBAYASHI (2004) Sr-bearing silicate minerals -itoigawaite and niigataite- in jadeitites and the related rocks from Wakasa district, Tottori Prefecture, Japan. Abstracts for the Meeting (2004) of the Mineralogical Society of Japan, k08-03
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