Bertrandite Mineral Data

Bertrandite Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images       News Help About


Weinrich Minerals
TIMA - Mineral Analyzer
TESCAN Integrated Mineral Analyzer (TIMA)
Fully automated, high throughput, analytical scanning electron microscope
Designed specifically for the mining and minerals processing industry

Wrights Rock Shop

General Bertrandite Information

Help on Chemical Formula: Chemical Formula: Be4Si2O7(OH)2
Help on Composition: Composition: Molecular Weight = 238.23 gm
   Beryllium  15.13 %  Be   42.00 % BeO
   Silicon    23.58 %  Si   50.44 % SiO2
   Hydrogen    0.85 %  H     7.56 % H2O
   Oxygen     60.44 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Be4(Si2O7)(OH)2
Help on Environment: Environment: Commonly found in Be-bearing pegmatites and may be derived from the alteration of beryl.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1883
Help on Locality: Locality: Discovered at near Nantes, Loire-Inferieure, France. Also found at Irkutka and Altai Mountains, Siberia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the French mineralogist, E. Bertrand.
Help on Name Pronunciation: Name Pronunciation: Bertrandite + Pronunciation Say BERTRANDITE
Help on Synonym: Synonym: ICSD 202360
  PDF 24-509
 

Bertrandite Image

Click Here for Larger Bertrandite Image in a New Browser Window Images:
Click Here for Larger Bertrandite Image

Bertrandite

Comments: Colorless prismatic crystals of bertrandite on matrix with pale pink rhombohedral crystals of rhodochrosite.
Location: Yiaoguanshen mine, Hunan Province, China. Scale: 3.5 x 4 cm.
© Dan Weinrich
Click Here for Larger Bertrandite Image in a New Browser Window Images:
Click Here for Larger Bertrandite Image

Bertrandite

Comments: Fan-like clusters of bertrandite crystals with brown rhodochrosite and quartz.
Location: Kara Oba, Kazakhstan. Scale: Crystal size 1.1 cm.
© John Veevaert

Bertrandite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.7514:1:0.5224
Help on Cell Dimensions: Cell Dimensions: a = 15.22, b = 8.69, c = 4.54, Z = 4; V = 600.47 Den(Calc)= 2.64
Help on Crystal System: Crystal System: Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Ccm21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.38(1), 3.19(0.9), 2.54(0.8),
Click Here for Large Bertrandite Structure Window Crystal Structure:

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


Downs J W , Ross F K , American Mineralogist , 72 (1987) p.979-983, Neutron-diffraction study of bertrandite, Note: O2y has been corrected

View Additional jPOWD Structure files for Bertrandite
[1] [2] [3]
 

Physical Properties of Bertrandite

Help on Cleavage: Cleavage: {001} Perfect, {110} Distinct, {101} Distinct
Help on Color: Color: Colorless, Pale yellow.
Help on Density: Density: 2.59 - 2.6, Average = 2.59
Help on Diaphaneity: Diaphaneity: Translucent to transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 6-7 - Orthoclase-Quartz
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white
 

Optical Properties of Bertrandite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2285,KPDmeas= 0.2325,KC= 0.2314
Ncalc = 1.6 - 1.61
Help on Optical Data: Optical Data: Biaxial (-), a=1.591, b=1.605, g=1.614, bire=0.0230, 2V(Calc)=76, 2V(Meas)=73-81. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
Help on Pleochroism (z): Pleochroism (z): none.
 

Calculated Properties of Bertrandite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.57 gm/cc
note: Specific Gravity of Bertrandite =2.60 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.16
Boson Index = 0.84
Help on Photoelectric: Photoelectric: PEBertrandite = 1.07 barns/electron
U=PEBertrandite x rElectron Density= 2.75 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bertrandite is Not Radioactive
 

Bertrandite Classification
Help on Dana Class: Dana Class: 56.01.01.01 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.01)with cations in [4] coordination
  (56.01.01)Dana Group
 
56.01.01.01 Bertrandite Be4Si2O7(OH)2 Ccm21 mm2
Help on Strunz Class: Strunz Class: 09.BD.05 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BD -Si2O7 groups with additional anions;
 
09.BD.05 Bertrandite Be4Si2O7(OH)2 Ccm21 mm2
 

Other Bertrandite Information
Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Bertrandite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - Scandinavian mineral gallery
17 - WWW-MINCRYST

Search for Bertrandite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Bertrandite :

B and L Fine Minerals
Dakota Matrix Minerals
Dan & Diana Weinrich Mineral Auctions
Excalibur Mineral Corp.
Exceptional Minerals
John Betts Fine Minerals
Mineral News
Mineral of the Month Club
NY/NJ Gem & Mineral Show
TIMA Mineral Analyzer
Weinrich Minerals, Inc.
Wright's Rock Shop

Ask about Bertrandite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

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

Bertrandite

Be4Si2O7(OH)2
Dana No: 56.01.01.01 Strunz No: 09.BD.05
Locality:

 

Notes: