Cymrite Mineral Data

Cymrite Mineral Data
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General Cymrite Information

Help on Chemical Formula: Chemical Formula: BaAl2Si2O8•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: BaAl2Si2O8•(H2O)
Help on Environment: Environment: Bedded manganese ore deposits that have undergone low- and medium-grade metamorphism.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1949
Help on Locality: Locality: Bennalt mine, Rhiw, Carnarvonshire, Scotland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Cymru, the old Welsh name for Wales.
Help on Synonym: Synonym: ICSD 39400
  PDF 17-507
 

Cymrite Image

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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
Help on Axial Ratios: Axial Ratios: a:b:c =0.1456:1:0.2095
Help on Cell Dimensions: Cell Dimensions: a = 5.33, b = 36.6, c = 7.67, Z = 8; beta = 90° V = 1,496.25 Den(Calc)= 3.49
Help on Crystal System: Crystal System: Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 21 (pseudo-HEX)
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.96(1), 3.96(0.9), 2.67(0.7),
Click Here for Large Cymrite Structure Window Crystal Structure:

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drag2 - RMB Resize/Rotate
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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

Help on Cleavage: Cleavage: {001} Good, {101} Fair
Help on Color: Color: Brown, Colorless, Green, Dark green.
Help on Density: Density: 3.41
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: white
 

Optical Properties of Cymrite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (-), a=1.611, b=1.619, g=1.621, bire=0.0100
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Cymrite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.19 gm/cc
note: Specific Gravity of Cymrite =3.41 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PECymrite = 150.59 barns/electron
U=PECymrite x rElectron Density= 480.28 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Cymrite is Not Radioactive
 

Cymrite Classification
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Cymrite

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

 

Notes: