Euclase Mineral Data

Euclase Mineral Data +

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General Euclase Information

Chemical Formula:

BeAlSiO4(OH)

Composition:

Molecular Weight = 145.08 gm

Beryllium 6.21 % Be 17.24 % BeO

Aluminum 18.60 % Al 35.14 % Al₂O₃

Silicon 19.36 % Si 41.41 % SiO₂

Hydrogen 0.69 % H 6.21 % H₂O

Oxygen 55.14 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BeAl(SiO₄)(OH)

Environment:

Hydrothermal, pegmatitic, and alluvial rocks.

IMA Status:

Valid Species (Pre-IMA) 1792

Locality:

Orenburg district in the southern Urals, Russia. Link to MinDat.org Location Data.

Name Origin:

From the Greek eu - "well" and klasis - "breaking."

Synonym:

ICSD 202094

PDF 14-65

Euclase Image

Images:

Euclase

Comments: Euclase with sharp edges and great color. This specimen is from one of the famous and finest world finds of euclase, in the Colombian Emeralds area.
Location: Chivor, Columbia. Scale: 1.2 x 0.6 cm.
© Fabre Minerals

Euclase Crystallography

Axial Ratios:

a:b:c =0.3333:1:0.3231

Cell Dimensions:

a = 4.763, b = 14.29, c = 4.618, Z = 4; beta = 100.3° V = 309.25 Den(Calc)= 3.12

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

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

By Intensity(I/I_o): 7.15(1), 3.219(0.5), 3.836(0.35),

Crystal Structure:

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Hazen R M , Au A Y , Finger L W , American Mineralogist , 71 (1986) p.977-984, High-pressure crystal chemistry of beryl (Be3Al2Si6O18) and euclase (BeAlSiO4OH), Sample: Pressure = .001 kbar

View Additional jPOWD Structure files for Euclase
[1] [2] [3] [4]

Physical Properties of Euclase

Cleavage:

[010] Perfect

Color:

Blue, Colorless, White, Light blue, Light green.

Density:

2.987 - 3.1, Average = 3.04

Diaphaniety:

Transparent to translucent

Fracture:

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

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

7.5 - Garnet

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Euclase

Gladstone-Dale:

CI meas= 0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.045 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2113,KPDmeas= 0.2166,KC= 0.2214

Optical Data:

Biaxial (+), a=1.652, b=1.655, g=1.671, bire=0.0190, 2V(Calc)=48, 2V(Meas)=50. Dispersion none.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Euclase

Electron Density:

r_electron=3.02 gm/cc
note: r_Euclase=3.04 gm/cc.

Fermion Index

Fermion Index = 0.07142
Boson Index = 0.92858

Photoelectric:

PE_Euclase= 1.36 barns/electron
U=PE_Euclase x r_electron= 4.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Euclase is Not Radioactive

Euclase Classification

Dana Class:

52.2.1.1 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.2)with cations in [4] and >[4] coordination

(52.2.1)Euclase group

52.2.1.1 Euclase BeAlSiO4(OH) P 2₁/a 2/m

52.2.1.2 Clinohedrite CaZnSiO4·(H2O) Aa m

52.2.1.3. Hodgkinsonite MnZn2SiO4(OH)2 P 2₁/c 2/m

52.2.1.4 Gerstmannite (Mg,Mn)2ZnSiO4(OH)2 Bbam 2/m 2/m 2/m

Strunz Class:

VIII/B.01-10 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]

VIII/B.01 - Euclase series

VIII/B.01-10 Euclase BeAlSiO4(OH) P 2₁/a 2/m

VIII/B.01-20 Hodgkinsonite MnZn2SiO4(OH)2 P 2₁/c 2/m

VIII/B.01-25 Sphaerobertrandite Be3SiO4(OH)2 P 2 2

VIII/B.01-30 Beryllite Be3SiO4(OH)2·(H2O) Unk Ortho

Other Euclase Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Print or Cut-and-Paste your Euclase Specimen Label here :

Euclase

BeAlSiO4(OH)
Dana No: 52.2.1.1 Strunz No: VIII/B.01-10
Locality:

Notes: