Carletonite Mineral Data

Carletonite Mineral Data +

General Carletonite Information

Chemical Formula:

KNa4Ca4Si8O18(CO3)4(OH,F)·(H2O)

Composition:

Molecular Weight = 1,027.61 gm

Potassium 2.85 % K 3.44 % K₂O

Sodium 7.83 % Na 10.55 % Na₂O

Calcium 14.63 % Ca 20.46 % CaO

Silicon 21.86 % Si 46.78 % SiO₂

Hydrogen 0.26 % H 2.28 % H₂O

Carbon 4.27 % C 15.63 % CO₂

Oxygen 47.57 % O

Fluorine 0.74 % F 0.74 % F

- % F -0.31 % -O=F₂

______ ______

100.00 % 99.57 % = TOTAL OXIDE

Empirical Formula:

K_0.75Na_3.5Ca_3.75Si₈O₁₈(CO₃)_3.65(OH)_0.6F_0.4·(H₂O)

Environment:

Found in cores of thermally metamorphosed wall-rock zenoliths of shale and limestone(hornfels and siliceous marble).

IMA Status:

Approved IMA 1971

Locality:

Mont Saint-Hilaire, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for Carleton University, Ottawa, Canada where it was first recognized.

Synonym:

ICSD 12100

IMA1969-016

PDF 25-628

Carletonite Image

Images:

Carletonite

Comments: Several crystals of blue and white carletonite.
Location: Mt. St. Hilaire, Quebec, Canada. Scale: 2.8 x 2.7 cm.
© John Veevaert

Carletonite Crystallography

Axial Ratios:

a:c = 1:1.26688

Cell Dimensions:

a = 13.178, c = 16.695, Z = 4; V = 2,899.25 Den(Calc)= 2.35

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/mbm

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

By Intensity(I/I_o): 8.353(1), 4.171(1), 2.903(0.9),2.384(0.6), 4.053(0.5), 4.816(0.4), 16.705(0.4),

Crystal Structure:

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Chao G Y , American Mineralogist , 57 (1972) p.765-778, The crystal structure of carletonite, KNa4Ca4Si8O18(CO3)4(F,OH).H2O,, a double-sheet silicate

Physical Properties of Carletonite

Cleavage:

[001] Perfect, [110] Distinct

Color:

Colorless, Light blue, Dark blue, Pink.

Density:

2.45

Diaphaniety:

Transparent to Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Carletonite

Dichroism (e):

very pale pinkish brown.

Dichroism (w):

very pale blue blue.

Gladstone-Dale:

CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.061 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2209,KPDmeas= 0.2118,KC= 0.2081

Optical Data:

Uniaxial (-), e=1.517, w=1.521, bire=0.0040.

Calculated Properties of Carletonite

Electron Density:

r_electron=2.44 gm/cc
note: r_Carletonite=2.45 gm/cc.

Fermion Index

Fermion Index = 0.0111
Boson Index = 0.9889

Photoelectric:

PE_Carletonite= 3.11 barns/electron
U=PE_Carletonite x r_electron= 7.59 barns/cc.

Radioactivity:

GRapi = 41.07 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Carletonite - barely detectable

Carletonite Classification

Dana Class:

72.3.1.4 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.3)with 3-, 4-, or 5-membered rings and 8-membered rings

(72.3.1)Apophyllite group (4- & 8-membered rings)

72.3.1.0 Apophyllite* KCa4(Si4O10)2F·8(H2O) P 4/mnc 4/m 2/m 2/m

72.3.1.1 Fluorapophyllite (K,Na)Ca4Si8O20(F,OH)·8(H2O) P 4/mnc 4/m 2/m 2/m

72.3.1.2 Hydroxyapophyllite KCa4Si8O20(OH,F)·8(H2O) P 4/mnc 4/m 2/m 2/m

72.3.1.3 Natroapophyllite NaCa4Si8O20F·8(H2O) Pnnm 2/m 2/m 2/m

72.3.1.4 Carletonite KNa4Ca4Si8O18(CO3)4(OH,F)·(H2O) P 4/mbm 4/m 2/m 2/m

Strunz Class:

VIII/H.07-10 VIII - Silicates

VIII/H - Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others

VIII/H.07 - Carletonite series

VIII/H.07-10 Carletonite KNa4Ca4Si8O18(CO3)4(OH,F)·(H2O) P 4/mbm 4/m 2/m 2/m

Other Carletonite Information

References:

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

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Carletonite

KNa4Ca4Si8O18(CO3)4(OH,F)·(H2O)
Dana No: 72.3.1.4 Strunz No: VIII/H.07-10
Locality:

Notes: