Celadonite Mineral Data

Celadonite Mineral Data +

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General Celadonite Information

Chemical Formula:

K(Mg,Fe++)(Fe+++,Al)[Si4O10](OH)2

Composition:

Molecular Weight = 429.02 gm

Potassium 9.11 % K 10.98 % K₂O

Magnesium 4.53 % Mg 7.52 % MgO

Aluminum 0.63 % Al 1.19 % Al₂O₃

Iron 14.32 % Fe 3.35 % FeO / 16.75 % Fe₂O₃

Silicon 26.19 % Si 56.02 % SiO₂

Hydrogen 0.47 % H 4.20 % H₂O

Oxygen 44.75 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KMg_0.8Fe²⁺_0.2Fe³⁺_0.9Al_0.1Si₄O₁₀(OH)₂

Environment:

Vesicle lining and coatings in altered volcanic of intermediate to basic compositions under low grade metamorphism.

IMA Status:

Valid Species (Pre-IMA) 1847

Locality:

Mt. Baldo, near Verona, Italy. Link to MinDat.org Location Data.

Name Origin:

Named from the French 'celadon,' sea-green, in allusion to its common color.

Synonym:

ICSD 200064

PDF 17-521

Celadonite Image

Images:

Celadonite

Comments: Greenish masses of celadonite filling vesicles in basaltic rock.
Location: Socorro County, New Mexico, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Celadonite Crystallography

Axial Ratios:

a:b:c =0.5773:1:1.1271

Cell Dimensions:

a = 5.223, b = 9.047, c = 10.197, Z = 2; beta = 100.433° V = 473.87 Den(Calc)= 3.01

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): 2.58(1), 4.53(0.85), 3.64(0.8),

Physical Properties of Celadonite

Cleavage:

[001] Perfect

Color:

Gray green, Bluish green.

Density:

2.95 - 3.05, Average = 3

Diaphaniety:

Translucent to opaque

Fracture:

Earthy - Dull, clay-like fractures with no visible crystalline affinities, (e.g. howlite).

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

2 - Gypsum

Luster:

Earthy (Dull)

Streak:

greenish white

Optical Properties of Celadonite

Gladstone-Dale:

CI meas= 0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2123,KPDmeas= 0.2131,KC= 0.2226

Optical Data:

Biaxial (-), a=1.606-1.644, b=1.63-1.662, g=1.63-1.663, bire=0.0190-0.0240, 2V(Calc)=0-26, 2V(Meas)=small.

Pleochroism (x):

yellowish green or yellowish green.

Pleochroism (y):

green or emerald green.

Pleochroism (z):

green or emerald green.

Calculated Properties of Celadonite

Electron Density:

r_electron=2.97 gm/cc
note: r_Celadonite=3.00 gm/cc.

Fermion Index

Fermion Index = 0.02002
Boson Index = 0.97998

Photoelectric:

PE_Celadonite= 6.26 barns/electron
U=PE_Celadonite x r_electron= 18.60 barns/cc.

Radioactivity:

GRapi = 130.24 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Celadonite - barely detectable

Celadonite Classification

Dana Class:

71.2.2a.6 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.2)with 2:1 Layers

(71.2.2a)Mica Group (Muscovite subgroup)

71.2.2a.1 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m

71.2.2a.2 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono

71.2.2a.3 Chernykhite (Ba,Na)V,Al)2(Si,Al)4O10(OH)2 C 2/c 2/m

71.2.2a.4 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m

71.2.2a.5 Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2 C 2/m 2/m

71.2.2a.6 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m

71.2.2a.6b Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m

71.2.2a.6c Ferro-aluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m

71.2.2a.6d Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m

71.2.2a.6e Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2

71.2.2a.7 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m

71.2.2a.8 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m

71.2.2a.9 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m

71.2.2a.10 Montdorite (K,Na)(Fe,Mn,Mg)2.5[Si4O10](F,OH)2 C 2/c 2/m

71.2.2a.11 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m

71.2.2a.12 Shirokshinite! K(NaMg2)Si4O10F2 C 2/m 2/m

Strunz Class:

VIII/H.10-30 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like layered silicates with [Si4O10]4- and related groups

VIII/H.10 - Mica group, Muscovite series

VIII/H.10-10 Aluminoceladonite! KAl(Mg,Fe)[]Si4O10(OH)2 2/m

VIII/H.10-20 Ferro-aluminoceladonite! K2Fe2Al2Si8O20(OH)4 C 2/m 2/m

VIII/H.10-30 Celadonite K(Mg,Fe)(Fe,Al)[Si4O10](OH)2 C 2/m 2/m

VIII/H.10-35 Chromceladonite! KCrMg(Si4O10)(OH)2 C 2 2

VIII/H.10-40 Ferroceladonite! K2FeFeSi8O20(OH)4 C 2/m 2/m

VIII/H.10-50 Paragonite NaAl2(Si3Al)O10(OH)2 C 2/c,Cc Mono

VIII/H.10-60 Boromuscovite KAl2(Si3B)O10(OH,F)2 C 2/m 2/m

VIII/H.10-70 Muscovite KAl2(Si3Al)O10(OH,F)2 C 2/m 2/m

VIII/H.10-80 Chromphyllite! (K,Ba)(Cr,Al)2[AlSi3O10](OH,F)2 C 2c 2/m

VIII/H.10-90 Roscoelite K(V,Al,Mg)2AlSi3O10(OH)2 C 2/m 2/m

VIII/H.10-95 Ganterite! [Ba0.5(Na,K)0.5]Al2(Si2.5Al1.5O10)(OH)2 C 2/c 2/m

VIII/H.10-100 Tobelite (NH4,K)Al2(Si3Al)O10(OH)2 C 2/m 2/m

VIII/H.10-110 Nanpingite Cs(Al,Mg,Fe,Li)2(Si3Al)O10(OH,F)2 C 2/c 2/m

Other Celadonite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Celadonite :
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
15 - WWW-MINCRYST

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Celadonite

K(Mg,Fe++)(Fe+++,Al)[Si4O10](OH)2
Dana No: 71.2.2a.6 Strunz No: VIII/H.10-30
Locality:

Notes: