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
Member of:
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.
Classification of Niigataite
Approved
Approval year:
2001
8/C.23-35
9.BG.05
9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
Physical Properties of Niigataite
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}
on {001}
Density:
3.63 g/cm3 (Calculated)
Chemical Properties of Niigataite
Formula:
{CaSr}{Al3}(Si2O7)(SiO4)O(OH)
IMA Formula:
CaSrAl3[Si2O7][SiO4]O(OH)
Common Impurities:
Fe
Crystallography of Niigataite
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°
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 Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.90 Å | (100) |
2.79 Å | (50) |
2.70 Å | (25) |
Type Occurrence of Niigataite
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:
Synonyms of Niigataite
Other Language Names for Niigataite
German:Niigatait
Japanese:新潟石
Russian:Клиноцоизит-(Sr)
Simplified Chinese:锶斜黝帘石
Spanish:Niigataita
Traditional Chinese:鍶斜黝簾石
Relationship of Niigataite to other Species
Member of:
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)) | {CaPb}{Fe3+AlMn3+}(Si2O7)(SiO4)O(OH) | |
Unnamed (Fe3+-analogue of Piemontite) | {CaCa}{Fe3+AlMn3+}(Si2O7)(SiO4)(OH,O)2 | |
Unnamed (Fe3+-analogue of Piemontite-(Sr)) | {CaSr}{Fe3+AlMn3+}(Si2O7)(SiO4)O(OH) | |
Unnamed (Ga-dominant member of the epidote group) | {Ca2}{Al2(Ga,Fe)}(Si2O7)(SiO4)O(OH) |
Related Minerals - Nickel-Strunz Grouping
9.BG. | Shuiskite-(Cr) | Ca2Cr3+Cr3+2[Si2O6OH][SiO4](OH)2O | Mon. 2/m : B2/m |
9.BG. | Alnaperbøeite-(Ce) | Ca(Ce2.5Na0.5)(AlAl2Al)[Si2O7][SiO4]3O(OH)2 | Mon. 2/m : P21/m |
9.BG. | Magnesiovesuvianite | Ca19MgAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9 | Tet. 4/m : P4/n |
9.BG. | Alumovesuvianite | Ca19AlAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 | Tet. 4/m : P4/n |
9.BG.05b | Allanite-(Ce) | {CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05b | Allanite-(La) | {CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05b | Allanite-(Y) | {CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH) | Mon. |
9.BG.05a | Clinozoisite | {Ca2}{Al3}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05b | Dissakisite-(Ce) | {CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05 | Dollaseite-(Ce) | {CaCe}{MgAlMg}(Si2O7)(SiO4)F(OH) | Mon. 2/m : P21/m |
9.BG.05a | Epidote | {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05a | Hancockite | {CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH) | Mon. |
9.BG.05 | Khristovite-(Ce) | {CaCe}{MgAlMn2+}(Si2O7)(SiO4)F(OH) | Mon. 2/m : P21/m |
9.BG.05a | Mukhinite | {Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH) | Mon. |
9.BG.05a | Piemontite | {Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05 | Piemontite-(Sr) | {CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH) | Mon. |
9.BG.05b | Manganiandrosite-(La) | {Mn2+La}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH) | Mon. |
9.BG.05 | Tawmawite | {Ca2}{(Al,Fe3+,Cr)3}(Si2O7)(SiO4)O(OH) | |
9.BG.05 | Tweddillite | {CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05b | Ferriallanite-(Ce) | {CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05 | Manganiandrosite-(Ce) | {Mn2+Ce}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05 | Dissakisite-(La) | {CaLa}{Al2Mg}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05 | Vanadoandrosite-(Ce) | {Mn2+Ce}{V3+AlMn2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05 | Uedaite-(Ce) | {Mn2+Ce}{Al2Fe2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05a | Epidote-(Sr) | {CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05b | Allanite-(Nd) | {CaNd}{Al2Fe2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05b | Ferriallanite-(La) | {CaLa}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH) | Mon. 2/m : P21/m |
9.BG.05b | Åskagenite-(Nd) | {Mn2+Nd}{Al2Fe3+}(Si2O7)(SiO4)O2 | Mon. 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+Ce}{Fe3+AlMn2+}(SiO4)(Si2O7)O(OH) | |
9.BG.9.BG | Ferriperbøeite-(Ce) | CaCe3(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2 | Mon. 2/m : P21/m |
9.BG.10 | Zoisite | Ca2Al3[Si2O7][SiO4]O(OH) | Orth. mmm (2/m 2/m 2/m) : Pnma |
9.BG.15 | Macfallite | Ca2Mn3+3(SiO4)(Si2O7)(OH)3 | Mon. |
9.BG.15 | Sursassite | Mn2+2Al3(SiO4)(Si2O7)(OH)3 | Mon. 2/m : P21/m |
9.BG.20 | Julgoldite-(Fe2+) | Ca2Fe2+Fe3+2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
9.BG.20 | Okhotskite | Ca2Mn2+Mn3+2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
9.BG.20 | Pumpellyite-(Fe2+) | Ca2Fe2+Al2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
9.BG.20 | Pumpellyite-(Fe3+) | Ca2Fe3+Al2[Si2O6OH][SiO4](OH)2O | Mon. |
9.BG.20 | Pumpellyite-(Mg) | Ca2MgAl2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
9.BG.20 | Pumpellyite-(Mn2+) | Ca2Mn2+Al2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
9.BG.20 | Shuiskite-(Mg) | Ca2MgCr3+2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
9.BG.20 | Julgoldite-(Fe3+) | Ca2Fe3+Fe3+2[Si2O6OH][SiO4](OH)2O | Mon. |
9.BG.20 | Pumpellyite-(Al) | Ca2AlAl2[Si2O6OH][SiO4](OH)2O | Mon. |
9.BG.20 | Poppiite | Ca2V3+V3+2[Si2O6OH][SiO4](OH)2O | Mon. 2/m : B2/m |
9.BG.20 | Julgoldite-(Mg) | Ca2MgFe3+2[Si2O6OH][SiO4](OH)2(OH) | Mon. |
9.BG.25 | Ganomalite | Pb9Ca5Mn(Si2O7)4(SiO4)O | Hex. |
9.BG.30 | Rustumite | Ca10(Si2O7)2(SiO4)(OH)2Cl2 | Mon. |
9.BG.35 | Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 | Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc |
9.BG.35 | Wiluite | Ca19MgAl4(Al,Mg)8(B,◻)4◻[Si2O7]4[(SiO4)10]O(O,OH)9 | Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc |
9.BG.35 | Manganvesuvianite | Ca19Mn3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 | Tet. 4/m : P4/n |
9.BG.35 | Fluorvesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(F,OH)9 | Tet. 4/mmm (4/m 2/m 2/m) |
9.BG.35 | Cyprine | Ca19Cu2+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9 | Tet. 4/m : P4/n |
9.BG.40 | Vyuntspakhkite-(Y) | (Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7 | Mon. |
9.BG.45 | Dellaite | Ca6Si3O11(OH)2 | Tric. |
9.BG.50 | Gatelite-(Ce) | CaCe3(AlAl2Mg)[Si2O7][SiO4]3O(OH)2 | Mon. 2/m : P21/b |
9.BG.55 | Västmanlandite-(Ce) | CaCe3(MgAl2Mg)[Si2O7][SiO4]3F(OH)2 | Mon. 2/m : P21/m |
Fluorescence of Niigataite
none
Other Information
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 Niigataite
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 Niigataite
mindat.org URL:
https://www.mindat.org/min-11460.html
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Localities for Niigataite
Locality List




All localities listed without proper references should be considered as questionable.
Japan | |
| 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 |
| Miyajima et al. (2003) Journal of Mineralogical and Petrological Sciences, 98, 118-129. |
| 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 |