Tunellite Mineral Data + Say TUNELLITE

General Tunellite Information

Help on Chemical  Formula: Chemical Formula: SrB6O9(OH)2·3(H2O)
Help on Composition: Composition: Molecular Weight = 384.54 gm
   Strontium  22.79 %  Sr   26.95 % SrO
   Boron      16.87 %  B    54.31 % B2O3
   Hydrogen    2.10 %  H    18.74 % H2O
   Oxygen     58.25 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: SrB6O9(OH)2·3(H2O)
Help on Environment: Environment: Borate deposits.
Help on IMA Status: IMA Status: Approved IMA 1961
Help on Locality: Locality: U. S. Borax open pit, Boron, Kern Co., California. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for George Tunnel (1900-1996), U. S. Mineralogist.
Help on Synonym: Synonym: Balavinskite ?
  ICSD 15479
  PDF 14-616
 

Tunellite Image

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

Tunellite

Comments: Clear, prismatic crystals of tunellite on matrix.
Location: Death Valley, Inyo County, California, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Tunellite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7521:1:1.2095
Help on Cell Dimensions: Cell Dimensions: a = 14.39, b = 8.213, c = 9.934, Z = 4; beta = 114.067° V = 1,071.99 Den(Calc)= 2.38
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): 6.57(1), 5.135(0.3), 6.97(0.25),
Click Here for Large Tunellite 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


Clark J R , American Mineralogist , 49 (1964) p.1549-1568, The crystal structure of tunellite, SrB6O9(OH)2.3H2O

View Additional jPOWD Structure files for Tunellite
[1]
 

Physical Properties of Tunellite

Help on Cleavage: Cleavage: [100] Perfect, [001] Distinct
Help on Color: Color: Colorless.
Help on Density: Density: 2.4
Help on Diaphaniety: Diaphaniety: Transparent
Help on Habit: Habit: Nodular - Tuberose forms having irregular protuberances over the surface.
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: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Fluorescent.
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white
 

Optical Properties of Tunellite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.026 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2272,KPDmeas= 0.2253,KC= 0.2196
Help on Optical Data: Optical Data: Biaxial (+), a=1.519, b=1.534, g=1.569, bire=0.0500
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Tunellite

Help on Electron Density: Electron Density:

relectron=2.35 gm/cc
note: rTunellite =2.40 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.04979
Boson Index = 0.95021
Help on Photoelectric: Photoelectric:

PETunellite = 24.87 barns/electron
U=PETunellite x relectron= 58.36 barns/cc.

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

Tunellite is Not Radioactive

 

Tunellite Classification

Help on  Dana Class: Dana Class: 26.6.6.2 (26)Hydrated Borates Containing Hydroxyl or Halogen
  (26.6)Dana Type
  (26.6.6)Dana Group
 
26.6.6.1 Nobleite CaB6O9(OH)2·3(H2O) P 21/a 2/m
 
26.6.6.2 Tunellite SrB6O9(OH)2·3(H2O) P 21/a 2/m
Help on  Strunz Class: Strunz Class: V/K.06-20 V - Nitrates, Carbonates and Borates
  V/K - Layered borates with complex groups [Bx(O,OH)y]
  V/K.06 - Nobleite - Balavinskite series
 
V/K.06-10 Nobleite CaB6O9(OH)2·3(H2O) P 21/a 2/m
 
V/K.06-20 Tunellite SrB6O9(OH)2·3(H2O) P 21/a 2/m
 
V/K.06-30 Balavinskite? Sr2B6O11·4(H2O) Mono ? Mono
 

Other Tunellite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Tunellite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

Search for Tunellite 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 Tunellite :
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 Tunellite Mineral Data :

Ask about Tunellite 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 Tunellite Specimen Label here :

Tunellite

SrB6O9(OH)2·3(H2O)
Dana No: 26.6.6.2 Strunz No: V/K.06-20
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