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Maruyamaite

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Formula:
K(MgAl2)(Al5Mg)(BO3)3(Si6O18)(OH)3O
Colour:
Pale brown to brown
Lustre:
Vitreous
Hardness:
7
Specific Gravity:
3.081 (Calculated)
Crystal System:
Trigonal
The first IMA-approved K member of the tourmaline group, found in high-pressure rocks. Related to oxy-dravite, of which it is the K analogue.

See also UM2000-64-SiO:BFeHKMg.

Supposed to originate near the peak pressure conditions of UHP metamorphism, within the diamond stability field.


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Classification of MaruyamaiteHide

IMA status:
Approved
Approval Year:
2013

Physical Properties of MaruyamaiteHide

Lustre:
Vitreous
Colour:
Pale brown to brown
Streak:
White to very pale-brown
Hardness:
7 on Mohs scale
Comment:
~7
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
No observable parting
Density:
3.081 g/cm3 (Calculated)

Optical Data of MaruyamaiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.632 - 1.636 nε = 1.650 - 16.520
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Pleochroism:
Visible
Comments:
O = darkish brown, E = pale brown

Chemical Properties of MaruyamaiteHide

Formula:
K(MgAl2)(Al5Mg)(BO3)3(Si6O18)(OH)3O
Elements listed:
Al, B, H, K, Mg, O, Si - search for minerals with similar chemistry

Crystallography of MaruyamaiteHide

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Setting:
R3m
Cell Parameters:
a = 15.955(1) Å, c = 7.227(1) Å
Ratio:
a:c = 1 : 0.453
Unit Cell V:
1593 ų
Z:
3
Morphology:
Anhedral to euhedral grains up to 2 mm across

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.415(23)
4.237(59)
3.995(69)
3.498(42)
2.974(85)
2.581(100)
2.046(54)
1.923(36)
Comments:
From Type Description.

Type Occurrence of MaruyamaiteHide

Type Locality:
ⓘ Kumdy-Kol area, Kokchetav Massif, Kokshetau (Kökshetau; Kokchetau; Kokchetav), Zerendy, Akmola, Kazakhstan
General Appearance of Type Material:
Anhedral to euhedral grains up to 2 mm across, embedded in a matrix of anhedral quartz and K-feldspar. May contain inclusions of microdiamonds.
Place of Conservation of Type Material:
Type material is deposited in the collections of the National Museum of Nature and Science, Tsukuba, Japan, registered number NSMMF15696
Geological Setting of Type Material:
Ultrahigh-pressure quartzofeldspathic gneisses
Associated Minerals at Type Locality:
QuartzK FeldsparDiamond

Synonyms of MaruyamaiteHide

Relationship of Maruyamaite to other SpeciesHide

Member of:
Tourmaline Group
Other Members of this group:
AdachiiteCaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)Trig. 3m : R3m
BosiiteNaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Chromium-draviteNa(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig.
Chromo-alumino-povondraiteNa(Cr3)(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
DarrellhenryiteNa(LiAl2)Al6(BO3)3Si6O18(OH)3O Trig. 3m : R3m
DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
Fluor-buergeriteNa(Fe3+3)Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
Fluor-draviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-elbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-feruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3F
Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-schorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-tsilaisiteNa(Mn2+)3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-uviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Foitite(□,Na)(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OHTrig. 3m : R3m
LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
LucchesiiteCaFe2+3 Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Luinaite-(OH)Na(Fe2+)3Al6(Si6O18)(BO3)3(OH)3(OH)Mon. m : Bm
Magnesio-foitite(□,Na)(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig.
OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)Trig.
Oxy-chromium-draviteNa(Cr)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
Oxy-draviteNa(MgAl2)MgAl5(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Oxy-foitite□(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m (3 2/m) : R3m
Oxy-rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3O
Oxy-schorlNa(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Oxy-uviteCaMg3Al6(Si6O18)(BO3)3(OH)3O
Oxy-vanadium-draviteNa(V)3(V4Mg2)Si6O18(BO3)3(OH)3OTrig. 3m : R3m
PovondraiteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3OTrig.
Rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
SchorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
TsilaisiteNa(Mn2+)3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
UM2000-64-SiO:BFeHKMgK, Mg, Fe, Si, B, O, H
Unnamed (Pb-dominant Tourmaline)(Pb,Na)(Li,Al)3Al6(Si6O18)(BO3)3(OH)3(F,OH)
Uvite SeriesCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)Trig. 3m : R3m
Vanadio-oxy-chromium-draviteNa(V)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
Vanadio-oxy-draviteNaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m

Fluorescence of MaruyamaiteHide

In UV light:
Non-fluorescent

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 MaruyamaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Lussier, A., Ball, N.A., Hawthorne, F.C., Henry, D.J., Shimizu, R., Ogasawara, Y. and Ota, T. (2014) Maruyamaite, IMA 2013- 123. CNMNC Newsletter No. 20, June 2014, page 550; Mineralogical Magazine, 78, 549-558.
Hawthorne, F.C., Lussier, A.J., Ball, N.A., Henry, D.J., Shimizu, R., Ogasawara, Y., Ota, T. (2016): Maruyamaite, K(MgAl2)(Al5Mg)Si6O18(BO3)3(OH)3O, from the ultrahigh-pressure Kokchetav massif, northern Kazakhstan: Description and crystal structure. American Mineralogist, 101, 355-361.

Internet Links for MaruyamaiteHide

Localities for MaruyamaiteHide

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.
Kazakhstan (TL)
 
  • Akmola
    • Zerendy
      • Kokshetau (Kökshetau; Kokchetau; Kokchetav)
        • Kokchetav Massif
Lussier, A., Ball, N.A., Hawthorne, F.C., Henry, D.J., Shimizu, R., Ogasawara, Y. and Ota, T. (2014) Maruyamaite, IMA 2013- 123. CNMNC Newsletter No. 20, June 2014, page 550; Mineralogical Magazine, 78, 549-558.
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