Caresite Mineral Data

Caresite Mineral Data

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General Caresite Information

Chemical Formula:

Fe++4Al2(OH)12CO3·3(H2O)

Composition:

Molecular Weight = 595.49 gm

Aluminum 9.06 % Al 17.12 % Al₂O₃

Iron 37.51 % Fe 48.26 % FeO

Hydrogen 3.05 % H 27.23 % H₂O

Carbon 2.02 % C 7.39 % CO₂

Oxygen 48.36 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺₄Al₂(CO₃)(OH)₁₂·3(H₂O)

Environment:

In silicate and carbonate cavities and in nepheline syenite pegmatites.

IMA Status:

Approved IMA 1997

Locality:

Poudrette quarry, Mont Saint-Hilaire, Rouville County, Quebec, as well as in the Corporation quarry, Montreal, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named after Steve Cares (1909-) and Janet Cares (1921-) of Sudbury, MA, Canada, who found the mineral.

Synonym:

IMA1992-030

Caresite Image

Images:

Caresite

Comments: Tabular brownish-yellow crystals of caresite in matrix.
Location: Poudrette quarry, Mt Saint-Hilaire, Rouville Co., Qu?bec, Canada. Scale: Picture size 2.5 mm.
© Thomas Witzke / Abraxas-Verlag

Caresite Crystallography

Axial Ratios:

a:c = 1:2.08051

Cell Dimensions:

a = 10.805, c = 22.48, Z = 6; V = 2,272.88 Den(Calc)= 2.61

Crystal System:

Trigonal - TrapezohedralH-M Symbol (3 2) Space Group: P 3₁12 or P 3₂12

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

By Intensity(I/I_o): 7.49(1), 3.746(0.5), 2.625(0.4),

Forms:

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Forms: [ 1 1 0] [ 0 0 1]

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Physical Properties of Caresite

Cleavage:

[001] Perfect

Color:

Colorless, Yellow, Orange brown.

Density:

2.57 - 2.59, Average = 2.58

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

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

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Caresite

Gladstone-Dale:

CI meas= 0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.044 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2239,KPDmeas= 0.2266,KC= 0.2343

Optical Data:

Uniaxial (-), e=1.57, w=1.599, bire=0.0290.

Calculated Properties of Caresite

Electron Density:

r_electron=2.58 gm/cc
note: r_Caresite=2.58 gm/cc.

Fermion Index

Fermion Index = 0.00841
Boson Index = 0.99159

Photoelectric:

PE_Caresite= 11.27 barns/electron
U=PE_Caresite x r_electron= 29.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Caresite is Not Radioactive

Caresite Classification

Dana Class:

16b.6.4.3 (16b)Carbonates - Hydroxyl or Halogen

(16b.6)Dana Type

(16b.6.4)Dana Group

16b.6.4.1 Quintinite-2H Mg4Al2(OH)12CO3·4(H2O) P 6₃22 6 2 2

16b.6.4.2 Quintinite-3T Mg4Al2(OH)12CO3·4(H2O) P 3₁12,P 3₂12 3 2

16b.6.4.3 Caresite Fe4Al2(OH)12CO3·3(H2O) P 3₁12 or P 3₂12 3 2

16b.6.4.4 Charmarite-2H Mn4Al2(CO3)(OH)12·3(H2O) P 6₃22 6 2 2

16b.6.4.5 Charmarite-3T Mn4Al2(CO3)(OH)12·3(H2O) P 3₁12 3 2

Strunz Class:

V/E.02-07 V - Nitrates, Carbonates and Borates

V/E - Water-bearing carbonates with unfamiliar anions

V/E.02 - Manasseite group

V/E.02-05 Quintinite-2H Mg4Al2(OH)12CO3·4(H2O) P 6₃22 6 2 2

V/E.02-05* Quintinite-3T Mg4Al2(OH)12CO3·4(H2O) P 3₁12,P 3₂12 3 2

V/E.02-07 Caresite Fe4Al2(OH)12CO3·3(H2O) P 3₁12 or P 3₂12 3 2

V/E.02-08 Charmarite-2H Mn4Al2(CO3)(OH)12·3(H2O) P 6₃22 6 2 2

V/E.02-08* Charmarite-3T Mn4Al2(CO3)(OH)12·3(H2O) P 3₁12 3 2

V/E.02-09 Zaccagnaite! Zn4Al2(OH)12(CO3)·3(H2O) P 6₃/mmc 6/m 2/m 2/m

V/E.02-10 Manasseite Mg6Al2(CO3)(OH)16·4(H2O) P 6₃/mmc 6/m 2/m 2/m

V/E.02-20 Chlormagaluminite (Mg,Fe)4Al2(OH)12(Cl2,CO3)·2(H2O) P 6/mcm, P 6cm, P 6c2 Hex

V/E.02-30 Barbertonite Mg6Cr2(CO3)(OH)16·4(H2O) P 6₃/mmc 6/m 2/m 2/m

V/E.02-40 Sjogrenite Mg6Fe2(CO3)(OH)14·5(H2O) P 6₃/mmc 6/m 2/m 2/m

Other Caresite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.83,p1347,1998) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Caresite :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas

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Caresite

Fe++4Al2(OH)12CO3·3(H2O)
Dana No: 16b.6.4.3 Strunz No: V/E.02-07
Locality:

Notes: