Quintinite-3T Mineral Data

Quintinite-3T Mineral Data +

[Newest Minerals] [Minerals for Sale] [Educational Articles] [About Us] [Image Gallery]
John Betts - Fine Minerals
Classic minerals, out-of-print books & magazines, plus informative articles for collectors

General Quintinite-3T 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 Demix quarry, Mont Saint-Hilaire, Quebec, Canada. 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).

Synonym:

IMA1992-029

Quintinite-3T Image

Images:

Click Here for Larger Quintinite-3T Image

Quintinite-3T Quintinite-2H

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

Quintinite-3T Crystallography

Axial Ratios:

a:c = 1:2.14833

Cell Dimensions:

a = 10.571, c = 22.71, Z = 6; V = 2,197.76 Den(Calc)= 2.21

Crystal System:

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

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

By Intensity(I/I_o): 7.57(1), 3.778(0.9), 2.57(0.4),

Physical Properties of Quintinite-3T

Cleavage:

[0001] Perfect

Color:

Colorless, Pale yellow, Bright yellow.

Density:

2.14

Diaphaniety:

Transparent

Fracture:

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

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Quintinite-3T

Gladstone-Dale:

CI meas= 0.02 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.051 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2412,KPDmeas= 0.2491,KC= 0.2542

Optical Data:

Uniaxial (+/-), a=1.533, b=1.533, bire=0.0000.

Calculated Properties of Quintinite-3T

Electron Density:

r_electron=2.21 gm/cc
note: r_{Quintinite-3T}=2.14 gm/cc.

Fermion Index

Fermion Index = 0.02052
Boson Index = 0.97948

Photoelectric:

PE_{Quintinite-3T}= 0.90 barns/electron
U=PE_{Quintinite-3T} x r_electron= 2.00 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Quintinite-3T is Not Radioactive

Quintinite-3T Classification

Dana Class:

16b.6.4.2 (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.02-05* 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 Quintinite-3T Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(Dana8) OPTIC PROP.(Am.Min.,Vol.83,p1347,1998)

See Also:

Links to other databases for Quintinite-3T :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

Search for Quintinite-3T using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Quintinite-3T :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Quintinite-3T Mineral Data :

Ask about Quintinite-3T here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Quintinite-3T Specimen Label here :

Quintinite-3T

Mg4Al2(OH)12CO3·4(H2O)
Dana No: 16b.6.4.2 Strunz No: V/E.02-05*
Locality:

Notes: