Colemanite Mineral Data + Say COLEMANITE

General Colemanite Information

Help on Chemical  Formula: Chemical Formula: Ca2B6O11·5(H2O)
Help on Composition: Composition: Molecular Weight = 411.09 gm
   Calcium   19.50 %  Ca   27.28 % CaO
   Boron     15.78 %  B    50.81 % B2O3
   Hydrogen   2.45 %  H    21.91 % H2O
   Oxygen    62.27 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2B6O11·5(H2O)
Help on Environment: Environment: Lacusterine limestone hosted borate deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1884
Help on Locality: Locality: Furnace Creek district, Death Valley, Inyo Co. California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: After William T. Coleman, owner of the Death Valley, California mine where this species was first found.
Help on Synonym: Synonym: ICSD 75921
  Neocolmanite
  PDF 33-267
 

Colemanite Image

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

Colemanite

Comments: Coarsely crystalline colemanite, in part, covered with minute acicular crystals of strontianite.
Location: Boraxo #3 pit, Death Valley, California, USA. Scale: 30 cm.
© Dave Barthelmy

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

Colemanite

Comments: Large crystals of brown colemanite with second generation of absolutely clear and gemmy (colorless) colemanite. Intensely fluorescent in long and short UV..
Location: Mustafakemalpascha Mine, West-Anatolia Turkey. Scale: Crystal size: 1.3 x 1 cm.
© Fabre Minerals

Colemanite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7761:1:0.5417
Help on Cell Dimensions: Cell Dimensions: a = 8.743, b = 11.264, c = 6.102, Z = 2; beta = 110.116° V = 564.27 Den(Calc)= 2.42
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.13(1), 3.85(0.5), 5.64(0.5),
Help on Forms: Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: [ 1 2 1] [ 1 1 1] [ 1 0 0] [ 1 1 1] [ 1 1 0] [ 0 0 1]

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Click Here for Large Colemanite 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


Burns P C , Hawthorne F C , The Canadian Mineralogist , 31 (1993) p.297-304, Hydrogen bonding in colemanite: An X-ray and structure-energy study

 

Physical Properties of Colemanite

Help on Cleavage: Cleavage: [010] Perfect, [001] Distinct
Help on Color: Color: Colorless, Gray, Gray white, Yellowish white, White.
Help on Density: Density: 2.42
Help on Diaphaniety: Diaphaniety: Transparent to translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Blocky - Crystal shape tends to be equant (e.g. feldspars).
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Colemanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.024 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2468,KPDmeas= 0.2468,KC= 0.241
Help on Optical Data: Optical Data: Biaxial (+), a=1.586, b=1.592, g=1.614, bire=0.0280, 2V(Calc)=56, 2V(Meas)=55-56. Dispersion relatively weak.
 

Calculated Properties of Colemanite

Help on Electron Density: Electron Density:

relectron=2.45 gm/cc
note: rColemanite =2.42 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.03196
Boson Index = 0.96804
Help on Photoelectric: Photoelectric:

PEColemanite = 2.61 barns/electron
U=PEColemanite x relectron= 6.38 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Colemanite is Not Radioactive

 

Colemanite Classification

Help on  Dana Class: Dana Class: 26.3.5.1 (26)Hydrated Borates Containing Hydroxyl or Halogen
  (26.3)Dana Type
  (26.3.5)Dana Group
 
26.3.5.1 Colemanite Ca2B6O11·5(H2O) P 21/a 2/m
Help on  Strunz Class: Strunz Class: V/J.03-10 V - Nitrates, Carbonates and Borates
  V/J - Chain borates with [B2O4]2- to [B6O10]2-
  V/J.03 - Colemanite - Hydroboracite series
 
V/J.03-10 Colemanite Ca2B6O11·5(H2O) P 21/a 2/m
 
V/J.03-20 Hydroboracite CaMgB6O8(OH)6·3(H2O) P 2/c 2/m
 

Other Colemanite Information

Help on References: References: NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Sinkankas66)
Help on See Also: See Also: Links to other databases for Colemanite :
1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Applied Mineralogy 4 -Athena 5 - EUROmin Project 6 - Glendale Community College 7 -Google Images 8 -Google Scholar 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 - Mineral and Gemstone Kingdom 14 -Mineralienatlas (Deutsch) 15 - Philatelic Mineralogy 16 -QUT Mineral Atlas 17 - WWW-MINCRYST 18 -École des Mines de Paris

Search for Colemanite using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Colemanite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Colemanite Mineral Data :

Ask about Colemanite 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 Español

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

Colemanite

Ca2B6O11·5(H2O)
Dana No: 26.3.5.1 Strunz No: V/J.03-10
Locality:

 

Notes:

 

 
   
 
Go To Webmineral Home Crystallography X-Ray D-Spacing Table Chemical Composition
Dana Classification Strunz Classification Table of Mineral Properties Alphabetical Listing of Minerals
Search Webmineral Photo Gallery of Mineral Images Help Files Links