Quintinite-2H Mineral Data

General Quintinite-2H Information

Chemical Formula:

Mg4Al2(OH)12CO3•4(H2O)

Composition:

Molecular Weight = 487.34 gm

Magnesium 19.95 % Mg 33.08 % MgO

Aluminum 11.07 % Al 20.92 % Al₂O₃

Hydrogen 4.14 % H 36.97 % H₂O

Carbon 2.46 % C 9.03 % CO₂

Oxygen 62.38 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₄Al₂(OH)₁₂(CO₃)•4(H₂O)

Environment:

Related to caresite-2H, charmarite-2H and charmarite-3T.

IMA Status:

Approved IMA 1995

Locality:

Found in the Jacupiranga mine, Sï¿½o Paulo, Brazil. Link to MinDat.org Location Data.

Name Origin:

Named after Quintin Wight (b. 1935), of Ottawa, Ontario, Canada, significant contributor to mineral studies at Mont Saint-Hilaire, and author of The Complete Book of micromounting ( 1993).

Name Pronunciation:

Quintinite-2H + Pronunciation

Synonym:

IMA1992-028

Quintinite-2H Image

Images:

Quintinite-2H Quintinite-3T

Comments: Pale brownish crystals of quintinite, 2H or 2T polytype unknown.
Location: Jacupiranga Mine, SÃ£o Paulo, Southeast Region, Brazil. Scale: Picture size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Quintinite-2H Crystallography

Axial Ratios:

a:c = 1:1.43515

Cell Dimensions:

a = 10.571, c = 15.171, Z = 4; V = 1,468.17 Den(Calc)= 2.20

Crystal System:

Hexagonal - Trapezohedral H-M Symbol (6 2 2) Space Group: P 6₃22

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

By Intensity(I/I_o): 3.785(1), 7.63(1), 1.825(0.2),

Physical Properties of Quintinite-2H

Cleavage:

{0001} Perfect

Color:

Colorless, Deep orange red, Orange, Pale brown.

Density:

2.14

Diaphaneity:

Transparent

Habit:

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

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Quintinite-2H

Gladstone-Dale:

CI meas= 0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.047 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2423,KPDmeas= 0.2491,KC= 0.2542
Ncalc = 1.54 - 1.56

Optical Data:

Uniaxial (+), w=1.533, e=1.533, bire=0.0000.

Calculated Properties of Quintinite-2H

Electron Density:

Bulk Density (Electron Density)=2.21 gm/cc
note: Specific Gravity of Quintinite-2H =2.14 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Quintinite-2H}= 0.90 barns/electron
U=PE_{Quintinite-2H} x rElectron Density= 2.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Quintinite-2H is Not Radioactive

Quintinite-2H Classification

Dana Class:

16b.06.04.01 (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 Quintinite-2H Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(Am.Min.,Vol.83,p1347,1998) OPTIC PROP.(Am.Min.,Vol.83,p1347,1998)

See Also:

Links to other databases for Quintinite-2H :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Quintinite-2H

Mg4Al2(OH)12CO3•4(H2O)
Dana No: 16b.06.04.01 Strunz No: 05.DA.40
Locality:

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