Cymrite Mineral Data

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),

Physical Properties of Cymrite

Cleavage:

[001] Good, [101] Fair

Color:

Brown, Colorless, Green, Dark green.

Density:

3.41

Diaphaniety:

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:

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

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:

r_electron=3.19 gm/cc
note: r_Cymrite=3.41 gm/cc.

Fermion Index

Fermion Index = 0.06904
Boson Index = 0.93096

Photoelectric:

PE_Cymrite= 150.59 barns/electron
U=PE_Cymrite x r_electron= 480.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cymrite is Not Radioactive

Cymrite Classification

Dana Class:

78.1.3.1 (78)Unclassified silicates

(78.1)possible nesosilicates

(78.1.3)Dana Group

78.1.3.1 Cymrite BaAl2Si2O8·(H2O) P 2₁ (pseudo-HEX) 2

Strunz Class:

VIII/H.38-60 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with tetrahedral-double layers and related structures

VIII/H.38 - Monteregianite-(Y) - Wickenburgite series

VIII/H.38-10 Monteregianite-(Y) (Na,K)6(Y,Ca)2Si16O38·10(H2O) P 2₁/m 2/m

VIII/H.38-20 Rhodesite KHCa2Si8O19·5(H2O) Pmam 2/m 2/m 2/m

VIII/H.38-30 Delhayelite (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3·18(H2O) Pnmm 2/m 2/m 2/m

VIII/H.38-40 Hydrodelhayelite KCa2AlSi7O17(OH)2·6(H2O) Pnm21 mm2

VIII/H.38-50 Macdonaldite BaCa4[Si16O36(OH)2]·10(H2O) C mcm 2/m 2/m 2/m

VIII/H.38-60 Cymrite BaAl2Si2O8·(H2O) P 2₁ (pseudo-HEX) 2

VIII/H.38-65 Kampfite! Ba6[(Si,Al)O2]8(CO3)2Cl2(Cl,H2O)2 P 6₃mmc, P 6₂c, P 6₃mc, P 3₁ Hex

VIII/H.38-80 Lourenswalsite (K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12 Unk (pseudo-HEX) Hex

VIII/H.38-90 Wickenburgite Pb3CaAl2Si10O27·4(H2O) P 3₁c 3m

Other Cymrite Information

References:

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

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Cymrite

BaAl2Si2O8·(H2O)
Dana No: 78.1.3.1 Strunz No: VIII/H.38-60
Locality:

Notes: