Cymrite Mineral Data

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General Cymrite Information

Chemical Formula:

BaAl2Si2O8•(H2O)

Composition:

Molecular Weight = 393.47 gm

Barium 34.90 % Ba 38.97 % BaO

Aluminum 13.71 % Al 25.91 % Al₂O₃

Silicon 14.28 % Si 30.54 % SiO₂

Hydrogen 0.51 % H 4.58 % H₂O

Oxygen 36.60 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaAl₂Si₂O₈•(H₂O)

Environment:

Bedded manganese ore deposits that have undergone low- and medium-grade metamorphism.

IMA Status:

Valid Species (Pre-IMA) 1949

Locality:

Bennalt mine, Rhiw, Carnarvonshire, Scotland. Link to MinDat.org Location Data.

Name Origin:

Named for Cymru, the old Welsh name for Wales.

Synonym:

ICSD 39400

PDF 17-507

Cymrite Image

Images:

Cymrite

Comments: Pearly white cymrite with jadeite in greywacke rock.
Location: Pacheco Pass, Santa Clara County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Cymrite Crystallography

Axial Ratios:

a:b:c =0.1456:1:0.2095

Cell Dimensions:

a = 5.33, b = 36.6, c = 7.67, Z = 8; beta = 90° V = 1,496.25 Den(Calc)= 3.49

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2₁ (pseudo-HEX)

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

By Intensity(I/I_o): 2.96(1), 3.96(0.9), 2.67(0.7),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
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Help on Above

Drits V A , Kashaev A A , Sokolova G V , Soviet Physics Crystallography , 20 (1975) p.171-175, Crystal structure of cymrite, Note: Y(O11) corrected

Physical Properties of Cymrite

Cleavage:

{001} Good, {101} Fair

Color:

Brown, Colorless, Green, Dark green.

Density:

3.41

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2-3 - Gypsum-Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Cymrite

Gladstone-Dale:

CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1768,KPDmeas= 0.1809,KC= 0.1826
Ncalc = 1.62 - 1.64

Optical Data:

Biaxial (-), a=1.611, b=1.619, g=1.621, bire=0.0100

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Cymrite

Electron Density:

Bulk Density (Electron Density)=3.19 gm/cc
note: Specific Gravity of Cymrite =3.41 gm/cc.

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Cymrite= 150.59 barns/electron
U=PE_Cymrite x rElectron Density= 480.28 barns/cc.

Radioactivity:

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

Cymrite Classification

Dana Class:

78.01.03.01 (78)Unclassified silicates

(78.01)possible nesosilicates

(78.01.03)Dana Group

78.01.03.01 Cymrite BaAl2Si2O8•(H2O) P 2₁ (pseudo-HEX) 2

Strunz Class:

09.EG.05 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EG -Double nets with 6-membered and larger rings

09.EG.05 Cymrite BaAl2Si2O8•(H2O) P 2₁ (pseudo-HEX) 2

Other Cymrite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Cymrite :
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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Ask about Cymrite here :
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Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
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Print or Cut-and-Paste your Cymrite Specimen Label here :

Cymrite

BaAl2Si2O8•(H2O)
Dana No: 78.01.03.01 Strunz No: 09.EG.05
Locality:

Notes: