Adachiite (original) (raw)

A valid IMA mineral species

About AdachiiteHide

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Formula:

CaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)

Colour:

Brownish–purple to bluish–purple

Specific Gravity:

3.228 (Calculated)

Name:

Named after 90 year old Tomio Adachi (b. 1923), retired high school teacher and amateur mineralogist who did a lot of investigation at the Kiura mine, the type locality for this new tourmaline species. Adachi served as an inspiration to some of the young collectors who later became professional mineralogists.

Adachiite is the first member of the tourmaline group formed via Tschermak–like substitution. This means it is the first aluminosilicate tourmaline (compare alumino-oxy-rossmanite). In terms of heteroatomic silicate group in tourmalines, the third member is ertlite - the first borosilicate (not to be confused with borate silicate) in the group.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:43780:2

3a3b4a5c-1b5d-488e-a593-3195e27440f7

IMA Classification of AdachiiteHide

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IMA Formula:

CaFe2+3Al6(Si5AlO18)(BO3)3(OH)3(OH)

Type description reference:

Nishio–Hamane, Daisuke, Minakawa, Tetsuo, Yamaura, Jun–ichi, Oyama, Takashi, Ohnishi, Masayuki, Shimobayashi, Norimasa (2014) Adachiite, a Si–poor member of the tourmaline supergroup from the Kiura mine, Oita Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 109 (2) 74-78 doi:10.2465/jmps.131020b

Classification of AdachiiteHide

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9.CK.

9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions

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 AdachiiteHide

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Colour:

Brownish–purple to bluish–purple

Comment:

Massive aggregates: black

Density:

3.228 g/cm3 (Calculated)

Optical Data of AdachiiteHide

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RI values:

_n_ω = 1.674(2) _n_ε = 1.644(2)

δ = 0.030

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Comments:

ω = dark green to dark blue
ε = brownish yellow

Chemistry of AdachiiteHide

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Mindat Formula:

CaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)

Crystallography of AdachiiteHide

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Class (H-M):

3_m_ - Ditrigonal Pyramidal

Cell Parameters:

a = 15.9290(2) Å, c = 7.1830(1) Å

Morphology:

Hexagonal prismatic crystals

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of AdachiiteHide

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General Appearance of Type Material:

As a constituent (several to 300 µm thickness) of hexagonal prismatic crystals, and forms a zoned structure closely associated with schorl.

Place of Conservation of Type Material:

National Museum of Nature and Science, Tsukuba, Japan (NSM-M43748).

Geological Setting of Type Material:

Hydrothermal vein cutting an emery deposit.

Associated Minerals at Type Locality:

Reference:

Nishio-Hamane, D., Minakawa, T., Yamaura, J., Oyama, T., Ohnishi, M., Shimobayashi, N. (2014): Adachiite, a Si-poor member of the tourmaline supergroup from the Kiura mine, Oita Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 109, 74-78.

Synonyms of AdachiiteHide

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Other Language Names for AdachiiteHide

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Relationship of Adachiite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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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 AdachiiteHide

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References for AdachiiteHide

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Reference List:

Nishio–Hamane, Daisuke, Minakawa, Tetsuo, Yamaura, Jun–ichi, Oyama, Takashi, Ohnishi, Masayuki, Shimobayashi, Norimasa (2014) Adachiite, a Si–poor member of the tourmaline supergroup from the Kiura mine, Oita Prefecture, Japan. Journal of Mineralogical and Petrological Sciences, 109 (2) 74-78 doi:10.2465/jmps.131020b

Localities for AdachiiteHide

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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.