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Yoshiokaite

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Formula:
Ca1-x(Al,Si)2O4
System:
Trigonal
Colour:
Colourless (white?)
Lustre:
Vitreous
Name:
Named after Takashi Yoshioka (1935-1983), mineralogist, Nihon Cement Company (Japan).
Nepheline Group.

Compare Unnamed (Ca-Al-(Si) oxide I), Unnamed (Ca-Al-(Si) oxide II), Unnamed (Ca-Al-(Si) oxide III), Unnamed (Ca-Al-(Si) oxide IV) and Unnamed (Ca-Al-Si oxide) - terrestrial phases also connected with high pressures.

Present as shocked crystal fragments and within devitrifed glasses in lunar regolith breccia. The glass may be due to shock melting of anorthite on ancient lunar highlands.

Metastable.


Classification of Yoshiokaite

IMA status:
Approved
Approval Year:
1989
Strunz 8th ed.:
8/J.02-60
Nickel-Strunz 10th (pending) ed.:
9.FA.05

9 : SILICATES (Germanates)
F : Tektosilicates without zeolitic H2O
A : Tektosilicates without additional non-tetrahedral anions
Dana 8th ed.:
76.2.1.6

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species
Hey's CIM Ref.:
16.9.3

16 : Silicates Containing Aluminum and other Metals
9 : Aluminosilicates of Ca

Physical Properties of Yoshiokaite

Lustre:
Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Colourless (white?)
Comment:
Semitransparent
Cleavage:
Poor/Indistinct
{101}

Optical Data of Yoshiokaite

Type:
Uniaxial (+)
RI values:
nω = 1.560 - 1.580 nε = 1.620 - 1.640
Max Birefringence:
δ = 0.060
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Yoshiokaite

IMA Formula:
Ca1-x(Al,Si)2O4
Elements listed in formula:
Al, Ca, O, Si - search for minerals with similar chemistry
Analytical Data:
Electron microprobe, wt.%, one of 2 analyses 
SiO2 28.0
TiO2 0.07
Al2O3 45.9
FeO 0.18
MgO 0.98
CaO 25.5
Na2O 0.00
K2O 0.00

total 100.7
Common Impurities:
Ti,Fe,Mg,Na,K

Crystallography of Yoshiokaite

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
P3
Cell Parameters:
a = 9.939 Å, c = 8.245 Å
Ratio:
a:c = 1 : 0.83
Unit Cell Volume:
V 705.35 ų (Calculated from Unit Cell)
Comment:
space group not sure
X-Ray Powder Diffraction Data:
d-spacingIntensity
8.57 (100)
2.979 (91)
3.718 (79)
2.871 (78)
1.158 (51)
2.062 (41)
4.123 (36)
(

Type Occurrence of Yoshiokaite

Type Locality:
Fra Mauro Base (Apollo 14 landing site), Fra Mauro Highlands, The Moon
General Appearance of Type Material:
strongly fractured, angular, anhedral crystals, up to 235 microns in size; likely shock-induced sets of {201} and {200} lamellae
Geological Setting of Type Material:
lunar regolith breccia (near Apollo 14 landing site)
Empirical Formula:
(Ca0.66Mg0.04)0.70(Al1.30Si0.67)1.97O4
Associated Minerals at Type Locality:
Glass

Relationship of Yoshiokaite to other Species

Related Minerals - Nickel-Strunz Grouping):
9.FA.05KaliophiliteKAlSiO4
9.FA.05KalsiliteKAlSiO4
9.FA.05NephelineNaAlSiO4
9.FA.05PanunziteK3Na(AlSiO4)4
9.FA.05TrikalsiliteK2NaAl3(SiO4)3
9.FA.05MegakalsiliteKAlSiO4
9.FA.10MalinkoiteNaBSiO4
9.FA.15VirgiliteLiAlSi2O6
9.FA.25LisitsyniteKBSi2O6
9.FA.30AdulariaKAlSi3O8
9.FA.30Anorthoclase(Na,K)AlSi3O8
9.FA.30Buddingtonite(NH4)AlSi3O8
9.FA.30CelsianBaAl2Si2O8
9.FA.30Hyalophane(K,Ba)(Al,Si)4O8
9.FA.30MicroclineKAlSi3O8
9.FA.30OrthoclaseKAlSi3O8
9.FA.30SanidineKAlSi3O8
9.FA.30RubiclineRbAlSi3O8
9.FA.30MonalbiteNaAlSi3O8
9.FA.35AlbiteNaAlSi3O8
9.FA.35Andesine(Na,Ca)[Al(Si,Al)Si2O8]
9.FA.35AnorthiteCaAl2Si2O8
9.FA.35Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Labradorite(Ca,Na)[Al(Al,Si)Si2O8]
9.FA.35Oligoclase(Na,Ca)[Al(Si,Al)Si2O8]
9.FA.35ReedmergneriteNaBSi3O8
9.FA.40ParacelsianBaAl2Si2O8
9.FA.45SvyatoslaviteCaAl2Si2O8
9.FA.45KumdykoliteNaAlSi3O8
9.FA.50SlawsoniteSrAl2Si2O8
9.FA.55LisetiteNa2CaAl4(SiO4)4
9.FA.60BanalsiteNa2BaAl4Si4O16
9.FA.60StronalsiteNa2SrAl4Si4O16
9.FA.65DanburiteCaB2Si2O8
9.FA.65MaleeviteBaB2Si2O8
9.FA.65PekoviteSrB2Si2O8
9.FA.70LinguniteNaAlSi3O8
9.FA.75KokchetaviteKAlSi3O8
Related Minerals - Hey's Index Grouping:
16.9.1GehleniteCa2Al(SiAl)O7
16.9.2AnorthiteCaAl2Si2O8
16.9.4SvyatoslaviteCaAl2Si2O8
16.9.5DmisteinbergiteCaAl2Si2O8
16.9.6GrossularCa3Al2(SiO4)3
16.9.7VuagnatiteCaAlSiO4(OH)
16.9.8ZoisiteCa2Al3(Si2O7)(SiO4)O(OH)
16.9.9ClinozoisiteCa2Al3(Si2O7)(SiO4)O(OH)
16.9.10PrehniteCa2Al(Si3Al)O10(OH)2
16.9.11KamaishiliteCa2(SiAl2)O6(OH)2
16.9.12BicchuliteCa2Al2SiO6(OH)2
16.9.13MargariteCaAl2(Si2Al2)O10(OH)2
16.9.14ChantaliteCaAl2SiO4(OH)4
16.9.15CebolliteCa5Al2(SiO4)3(OH)4
16.9.17KatoiteCa3Al2(OH)12
16.9.18LawsoniteCaAl2Si2O7(OH)2 · H2O
16.9.19ParthéiteCa2(Si4Al4)O15(OH)2 · 4H2O
16.9.20WairakiteCa(Si4Al2)O12 · 2H2O
16.9.21VertumniteCa4Al4Si4O6(OH)24 · 3H2O
16.9.22ScoleciteCa(Si3Al2)O10 · 3H2O
16.9.23LaumontiteCa(Si4Al2)O12 · 4H2O
16.9.24YugawaraliteCa(Si6Al2)O16 · 4H2O
16.9.25Gismondine-CaCaAl2Si2O8 · 4H2O
16.9.26EpistilbiteCa3(Si18Al6)O48 · 16H2O
16.9.27GoosecreekiteCa(Si6Al2)O16 · 5H2O
16.9.28CowlesiteCa(Al2Si3)O10 · 5-6H2O
16.9.30StelleriteCa4(Si28Al8)O72 · 28H2O
16.9.31SträtlingiteCa2Al(Si,Al)2O2(OH)10 · 2.25H2O
16.9.32AmstalliteCaAl(Si,Al)4O8(OH)4 · (H2O,Cl)

Other Names for Yoshiokaite

Name in Other Languages:
German:Yoshiokait
Spanish:Yoshiokaita

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 Yoshiokaite

Reference List:
- Vaniman D.T. and Bish D.L. (1990). Yoshiokaite, a new Ca, Al-silicate mineral from the Moon. American Mineralogist, 75, p. 676-686.

Steele, I. M., & Pluth, J. J. (1990). Crystal structure of synthetic yoshiokaite, a stuffed derivative of the tridymite structure. American Mineralogist, 75(9-10), 1186-1191.

Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C., Eds. Handbook of Mineralogy, Mineralogical Society of America, Chantilly, VA 20151-1110, USA. http://www.handbookofmineralogy.org/ (2016)

Internet Links for Yoshiokaite

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    • Localities for Yoshiokaite

    (TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    The Moon (TL)
     
    • Fra Mauro Highlands
    		Amer.Min.(1990) 75, 676-686
    Mineral and/or Locality  
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