Tobelite Mineral Data

Advertisment

Exceptional Minerals features excellent, high quality mineral specimens for sale. We also have a weekly Best Offer Mineral Auction.

Adamsminerals.com- Online mineral store front for mineral collectors

Your premier supplier of quality mineral specimens from Southern Africa and the world at large

General Tobelite Information

Chemical Formula:

(NH4,K)Al2(Si3Al)O10(OH)2

Composition:

Molecular Weight = 376.27 gm

Potassium 2.08 % K 2.50 % K₂O

Aluminum 20.08 % Al 37.94 % Al₂O₃

Silicon 23.89 % Si 51.10 % SiO₂

Hydrogen 0.54 % H - % Calc as (NH₄)₂O

Hydrogen 0.54 % H 4.79 % H₂O

Nitrogen 1.86 % N 3.46 % (NH₄)₂O

Oxygen 51.03 % O

______ ______

100.00 % 99.79 % = TOTAL OXIDE

Empirical Formula:

(NH₄)_0.5K_0.2Al₂Si_3.2Al_0.8O₁₀(OH)₂

Environment:

Hydrothemal alteration of biotite andesite dike or in a hydrothermally altered rhyolite tuff.

IMA Status:

Approved IMA 1982

Locality:

Ohgidani pottery stone deposit, Tobe, Ehime Prefecture, adn in the Horo pryophyllite deposit, Toyosaka, hiroshima Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Tobelite

Tobelite Image

Images:

Tobelite

Comments: Fine grained massive tobelite.
Location: Tobe, Ehime, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Tobelite Crystallography

Axial Ratios:

a:b:c =0.5807:1:1.1625

Cell Dimensions:

a = 5.219, b = 8.986, c = 10.447, Z = 2; beta = 101.31° V = 480.43 Den(Calc)= 2.60

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 10.24(1), 3.408(0.6), 2.566(0.45),

Physical Properties of Tobelite

Cleavage:

{001} Perfect

Color:

Yellowish green, Pearly white.

Density:

2.58

Diaphaneity:

Transparent

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Habit:

Scaly - Morphology like fish scales.

Hardness:

2 - Gypsum

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Tobelite

Gladstone-Dale:

CI meas= -0.083 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.074 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2213,KPDmeas= 0.2231,KC= 0.206
Ncalc = 1.53 - 1.54

Optical Data:

Biaxial (-), a=1.555-1.56, b=1.575-1.587, g=1.581-1.595, bire=0.0260-0.0350, 2V(Calc)=56, 2V(Meas)=28-30.

Calculated Properties of Tobelite

Electron Density:

Bulk Density (Electron Density)=2.61 gm/cc
note: Specific Gravity of Tobelite =2.60 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Tobelite= 1.72 barns/electron
U=PE_Tobelite x r_electron= 4.49 barns/cc.

Radioactivity:

GRapi = 30.06 (Gamma Ray American Petroleum Institute Units)
Concentration of Tobelite per GRapi unit = 3.33 (%)

Estimated Radioactivity from Tobelite - barely detectable

Tobelite Classification

Dana Class:

71.02.02a.07 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.02)with 2:1 Layers

(71.02.02a)Mica Group (Muscovite subgroup)

71.02.02a.01 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m

71.02.02a.02 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono

71.02.02a.03 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m

71.02.02a.04 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m

71.02.02a.05 Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 C 2/m 2/m

71.02.02a.06 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m

71.02.02a.06b Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m

71.02.02a.06c Ferroaluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m

71.02.02a.06d Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m

71.02.02a.06e Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2

71.02.02a.07 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m

71.02.02a.08 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m

71.02.02a.09 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m

71.02.02a.10 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m

71.02.02a.11 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m

71.02.02a.12 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m

Strunz Class:

09.EC.15 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets

09.EC.15 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m

09.EC.15 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m

09.EC.15 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m

09.EC.15 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m

09.EC.15 Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 C 2/m 2/m

09.EC.15 Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m

09.EC.15 Ferroaluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m

09.EC.15 Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m

09.EC.15 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m

09.EC.15 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m

09.EC.15 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m

09.EC.15 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m

09.EC.15 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m

09.EC.15 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono

09.EC.15 Tainiolite KLiMg2Si4O10F2 C 2/m 2/m

09.EC.15 Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2

09.EC.15 Ganterite! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 2/m

Other Tobelite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Tobelite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Tobelite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Tobelite :

A Bijoux Google Search for Tobelite
Adam's Minerals Google Search for Tobelite
Cape Minerals Google Search for Tobelite
Dakota Matrix Minerals Google Search for Tobelite
Excalibur Mineral Corp. Google Search for Tobelite
Exceptional Minerals Google Search for Tobelite
John Betts Fine Minerals Search for Tobelite
McDougall Minerals Google Search for Tobelite
Mineral News Website Link
Rock and Mineral Shows Google Search for Tobelite
Weinrich Minerals, Inc. Google Search for Tobelite

Ask about Tobelite 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 Tobelite Specimen Label here :

Tobelite

(NH4,K)Al2(Si3Al)O10(OH)2
Dana No: 71.02.02a.07 Strunz No: 09.EC.15
Locality:

Notes: