Niigataite (original) (raw)

A valid IMA mineral species

About NiigataiteHide

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Formula:

(CaSr)(AlAlAl)O[Si2O7][SiO4](OH)

Colour:

Pale grey to yellowish green

Specific Gravity:

3.63 (Calculated)

Crystal System:

Monoclinic

Name:

Named for Niigata prefecture, Japan, that includes the type locality.

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.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:11460:0

34eb43e0-fb4a-40d6-a8a2-b64656be1167

IMA Classification of NiigataiteHide

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IMA Formula:

CaSrAl3[Si2O7][SiO4]O(OH)

Type description reference:

Miyajima, Hiroshi, Matsubara, Satoshi, Miyawaki, Ritsuro, Hirokawa, Kazuo (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 Mineralogical and Petrological Sciences, 98 (3) 118-129 doi:10.2465/jmps.98.118

Classification of NiigataiteHide

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9.BG.05

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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of NiigataiteHide

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Colour:

Pale grey to yellowish green

Density:

3.63 g/cm3 (Calculated)

Optical Data of NiigataiteHide

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Comments:

1.67 < n <1.725, anomalous violet interference color.

Chemistry of NiigataiteHide

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Mindat Formula:

(CaSr)(AlAlAl)O[Si2O7][SiO4](OH)

Crystallography of NiigataiteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 8.890(4) Å, b = 5.5878(18) Å, c = 10.211(4) Å
β = 115.12(3)°

Ratio:

a:b:c = 1.591 : 1 : 1.827

Unit Cell V:

459.26 ų (Calculated from Unit Cell)

Morphology:

anhedral grains

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Type Occurrence of NiigataiteHide

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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:

National Science Museum in Tokyo, and in the Fossa Magna Museum, Itoigawa, Niigata, Japan.

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:

Reference:

Miyajima, H., Matsubara, S., Miyawaki, R., Hirokawa, K. (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.

Synonyms of NiigataiteHide

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Other Language Names for NiigataiteHide

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Relationship of Niigataite to other SpeciesHide

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Other Members of this group:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of NiigataiteHide

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Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for NiigataiteHide

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References for NiigataiteHide

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Reference List:

Miyajima, Hiroshi, Matsubara, Satoshi, Miyawaki, Ritsuro, Hirokawa, Kazuo (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 Mineralogical and Petrological Sciences, 98 (3) 118-129 doi:10.2465/jmps.98.118

Localities for NiigataiteHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.