Tobelite Mineral Data

[On-Line Catalogue] [On-Line Auctions] [eBay] [Contact Us] [Policies]
We specialize in fine European and Asian Mineral Specimens
Heliodor is based in Prague, Czech Republic

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Tobelite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Tobelite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Tobelite Mineral Data :

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: