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., Québec, 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),

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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

Diaphaneity:

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
Ncalc = 1.6 - 1.61

Optical Data:

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

Calculated Properties of Caresite

Electron Density:

Bulk Density (Electron Density)=2.58 gm/cc
note: Specific Gravity of Caresite =2.58 gm/cc.

Fermion Index:

Fermion Index = 0.0084113378
Boson Index = 0.9915886622

Photoelectric:

PE_Caresite= 11.27 barns/electron
U=PE_Caresite x rElectron Density= 29.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Caresite is Not Radioactive

Caresite Classification

Dana Class:

16b.06.04.03 (16b)Carbonates - Hydroxyl or Halogen

(16b.06)Dana Type

(16b.06.04)Quintinite - Charmarite Group

16b.06.04.01 Quintinite-2H Mg4Al2(OH)12CO3•4(H2O) P 6₃22 6 2 2

16b.06.04.02 Quintinite-3T Mg4Al2(OH)12CO3•4(H2O) P 3₁12,P 3₂12 3 2

16b.06.04.03 Caresite Fe4Al2(OH)12CO3•3(H2O) P 3₁12 or P 3₂12 3 2

16b.06.04.04 Charmarite-2H Mn4Al2(CO3)(OH)12•3(H2O) P 6₃22 6 2 2

16b.06.04.05 Charmarite-3T Mn4Al2(CO3)(OH)12•3(H2O) P 3₁12 3 2

Strunz Class:

05.DA.40 05 - CARBONATES (NITRATES)

05.D - Carbonates with Additional Anions, with H2O

05.DA -With medium-sized cations

05.DA.40 Charmarite-3T Mn4Al2(CO3)(OH)12•3(H2O) P 3₁12 3 2

05.DA.40 Charmarite-2H Mn4Al2(CO3)(OH)12•3(H2O) P 6₃22 6 2 2

05.DA.40 Caresite Fe4Al2(OH)12CO3•3(H2O) P 3₁12 or P 3₂12 3 2

05.DA.40 Quintinite-2H Mg4Al2(OH)12CO3•4(H2O) P 6₃22 6 2 2

05.DA.40 Quintinite-3T Mg4Al2(OH)12CO3•4(H2O) P 3₁12,P 3₂12 3 2

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

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Caresite

Fe++4Al2(OH)12CO3•3(H2O)
Dana No: 16b.06.04.03 Strunz No: 05.DA.40
Locality:

Notes: