Yugawaralite Mineral Data

General Yugawaralite Information

Chemical Formula:

CaAl2Si6O16•4(H2O)

Composition:

Molecular Weight = 590.61 gm

Calcium 6.79 % Ca 9.49 % CaO

Aluminum 9.14 % Al 17.26 % Al₂O₃

Silicon 28.53 % Si 61.04 % SiO₂

Hydrogen 1.37 % H 12.20 % H₂O

Oxygen 54.18 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaAl₂Si₆O₁₆•4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1952

Locality:

Yugawara Hot Springs, Kanagawa Prefecture, Honshu, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Yugawaralite + Pronunciation

Synonym:

ICSD 29505

PDF 39-1372

Yugawaralite Image

Images:

Yugawaralite

Comments: Pearly translucent colorless yugawaralite microcrystals.
Location: Klif Hvalfjordur, Iceland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Yugawaralite

Comments: Yugawaralite, in well developed vitreous crystals up to 1 cm. in a large vug on matix.
Location: Khandivaly Quarry, Maharastra, India. Scale: Picture size 2 cm.
© Sandro Maggia/Minernet.it

Yugawaralite Crystallography

Axial Ratios:

a:b:c =0.4804:1:0.7187

Cell Dimensions:

a = 6.728, b = 14.004, c = 10.066, Z = 2; beta = 111.13° V = 884.64 Den(Calc)= 2.22

Crystal System:

Monoclinic - Domatic H-M Symbol (m) Space Group: Pc

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

By Intensity(I/I_o): 3.056(1), 5.82(0.9), 4.68(0.85),

Physical Properties of Yugawaralite

Cleavage:

{010} Indistinct

Color:

Colorless, White.

Density:

2.23

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Yugawaralite

Gladstone-Dale:

CI meas= 0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2246,KPDmeas= 0.2236,KC= 0.2241
Ncalc = 1.5

Optical Data:

Biaxial (+), a=1.495, b=1.497, g=1.504, bire=0.0090, 2V(Calc)=58, 2V(Meas)=78.

Calculated Properties of Yugawaralite

Electron Density:

Bulk Density (Electron Density)=2.24 gm/cc
note: Specific Gravity of Yugawaralite =2.22 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Yugawaralite= 2.21 barns/electron
U=PE_Yugawaralite x rElectron Density= 4.96 barns/cc.

Radioactivity:

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

Yugawaralite Classification

Dana Class:

77.01.07.02 (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.07)Brewsterite and related species

77.01.07.01 Brewsterite-Sr (Sr,Ba)Al4Si12O32•10(H2O) P 2₁/m 2/m

77.01.07.01a Brewsterite-Ba! (Ba,Sr)Al2Si6O16•5(H2O) P 2₁/m,P 2₁ Mono

77.01.07.02 Yugawaralite CaAl2Si6O16•4(H2O) Pc m

77.01.07.03 Goosecreekite CaAl2Si6O16•5(H2O) P 2₁ 2

77.01.07.04 Roggianite Ca2[Be(OH)2Al2Si4O13]•<2•5(H2O) I 4/mcm 4/m 2/m 2/m

Strunz Class:

09.GB.15 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GB -Chains of single connected 4-membered rings

09.GB.15 Yugawaralite CaAl2Si6O16•4(H2O) Pc m

Other Yugawaralite Information

References:

NAME( CanMin, v 35, p 1591) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Yugawaralite :
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
16 - Zeolite Database by Bruno Herreros

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Yugawaralite

CaAl2Si6O16•4(H2O)
Dana No: 77.01.07.02 Strunz No: 09.GB.15
Locality:

Notes:

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