Yoshiokaite Mineral Data

General Yoshiokaite Information

Chemical Formula:

(Ca8-(x/2)[ ](x/2)Al16-xSixO32)

Composition:

Molecular Weight = 1,245.37 gm

Calcium 24.14 % Ca 33.77 % CaO

Aluminum 32.50 % Al 61.40 % Al₂O₃

Silicon 2.26 % Si 4.82 % SiO₂

Oxygen 41.11 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca_7.5Al₁₅SiO₃₂

Environment:

A metastable phase, as shocked crystal fragments and in devitrified glasses in a regolith breccia. The glass may have resulted from shock melting of alkali anorthite on the ancient lunar highlands.

IMA Status:

Approved IMA 1990

Locality:

On the Moon, near the Apollo 14 landing site. Link to MinDat.org Location Data.

Name Origin:

Named for T. Yoshioka (1935-1983), who studied the synthetic phase.

Name Pronunciation:

Yoshiokaite + Pronunciation

Synonym:

ICSD 69380

IMA1989-043

PDF 46-1336

Yoshiokaite Image

Images:

Yoshiokaite

Comments: B&W image of the largest yoshiokaite crystal yet found (grain #23); note fracturing probably caused by shock deformation and the groundmass of regolith glass. (AmMin v75:676).
Location: At a distance of about 224 m from their Apollo 14 lunar lander, in the bottom of a 30-cm-deep trench, Mitchell and Shepard collected the two-gram rock that is regolith breccia 14076. Scale: Scale Bar 50 µm.
© American Mineralogist

Yoshiokaite Crystallography

Axial Ratios:

a:c = 1:0.82956

Cell Dimensions:

a = 9.939, c = 8.245, Z = 1; V = 705.35 Den(Calc)= 2.93

Crystal System:

Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: P 3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 8.57(1), 2.979(0.91), 3.718(0.79),

Physical Properties of Yoshiokaite

Cleavage:

{???} Indistinct

Color:

White, Colorless.

Density:

2.76 - 2.9, Average = 2.83

Diaphaneity:

Translucent

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Yoshiokaite

Gladstone-Dale:

CI meas= -0.019 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2048,KPDmeas= 0.212,KC= 0.2081
Ncalc = 1.57 - 1.61

Optical Data:

Uniaxial (+), w=1.56-1.58, e=1.62-1.64, bire=0.0600.

Calculated Properties of Yoshiokaite

Electron Density:

Bulk Density (Electron Density)=2.89 gm/cc
note: Specific Gravity of Yoshiokaite =2.93 gm/cc.

Fermion Index:

Fermion Index = 0.0015763399
Boson Index = 0.9984236601

Photoelectric:

PE_Yoshiokaite= 4.02 barns/electron
U=PE_Yoshiokaite x rElectron Density= 11.62 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Yoshiokaite is Not Radioactive

Yoshiokaite Classification

Dana Class:

76.02.01.06 (76)Tectosilicate Al-Si Framework

(76.02)Feldspathoids and related species

(76.02.01)Nepheline group

76.02.01.01 Kalsilite KAlSiO4 P 3₁c 3m

76.02.01.02 Nepheline (Na,K)AlSiO4 P 6₃ 6

76.02.01.03 Trikalsilite (K,Na)AlSiO4 P 6₃ 6

76.02.01.04 Panunzite (K,Na)AlSiO4 P 6₃ 6

76.02.01.05 Kaliophilite KAlSiO4 P 6₃22 6 2 2

76.02.01.06 Yoshiokaite (Ca8-(x/2)[](x/2)Al16-xSixO32) P 3 3

76.02.01.07 Megakalsilite! KAlSiO4 P 6₃ 6

Strunz Class:

09.FA.05 09 - SILICATES (Germanates)

09.F - Tektosilicates without Zeolitic H2O

09.FA -Tektosilicates without additional non-tetrahedral anions, (Al,B):Si = 1:1

09.FA.05 Nepheline (Na,K)AlSiO4 P 6₃ 6

09.FA.05 Kaliophilite KAlSiO4 P 6₃22 6 2 2

09.FA.05 Kalsilite KAlSiO4 P 3₁c 3m

09.FA.05 Panunzite (K,Na)AlSiO4 P 6₃ 6

09.FA.05 Trikalsilite (K,Na)AlSiO4 P 6₃ 6

09.FA.05 Megakalsilite! KAlSiO4 P 6₃ 6

09.FA.05 Yoshiokaite (Ca8-(x/2)[](x/2)Al16-xSixO32) P 3 3

Other Yoshiokaite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.75,p676-686,1990) OPTIC PROP.(Am.Min.,Vol.75,p676-686,1990)

See Also:

Links to other databases for Yoshiokaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Yoshiokaite

(Ca8-(x/2)[ ](x/2)Al16-xSixO32)
Dana No: 76.02.01.06 Strunz No: 09.FA.05
Locality:

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