Quintinite-2H (original) (raw)

About Quintinite-2HHide

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Formula:

Mg4Al2(OH)12(CO3) · 3H2O

Colour:

Deep orange-red, orange, pale brown

Name:

Named in 1997 by George Y. Chao and Robert A. Gault in honor of Quintin Wight [b. April 23, 1935 Canada], of Ottawa, Ontario, Canada, significant contributor to mineral studies at Mont Saint-Hilaire, and author of "The Complete Book of Micromounting" (1993). The 3T polytype was first found at Mont Saint-Hilaire.

A polytype of Quintinite

The 2H polytype was originally described from Jacupiranga alkaline complex, Cajati, São Paulo, Brazil.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:31536:0

Physical Properties of Quintinite-2HHide

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Colour:

Deep orange-red, orange, pale brown

Fracture:

Irregular/Uneven

Density:

2.14(1) g/cm3 (Measured) 2.15 g/cm3 (Calculated)

Optical Data of Quintinite-2HHide

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RI values:

_n_ω = 1.533(1) _n_ε = 1.533

δ = 0.000 - 0.533

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Comments:

ω = yellow, ε = lighter yellow.

Chemistry of Quintinite-2HHide

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Mindat Formula:

Mg4Al2(OH)12(CO3) · 3H2O

Crystallography of Quintinite-2HHide

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Class (H-M):

622 - Trapezohedral

Cell Parameters:

a = 10.571 Å, c = 15.171 Å

Unit Cell V:

1,468.17 ų (Calculated from Unit Cell)

Morphology:

As equant and prismatic crystals displaying the forms {0001} and an {hkil} trapezohedron with or without {1010}.

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Jacupiranga alkaline complex, São Paulo, Brazil. Data are from the type description.

Synonyms of Quintinite-2HHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Fluorescence of Quintinite-2HHide

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Other InformationHide

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Notes:

Attacked slightly by 1:1 HCl, more strongly by 1:1 HNO3, and very strongly by 1:1 H2SO4, all with effervescence.

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Quintinite-2HHide

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References for Quintinite-2HHide

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Localities for Quintinite-2HHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Brazil
São Paulo Cajati ⓘ Jacupiranga mine	Chao et al. (1997)
Russia
Irkutsk Oblast Nizhneilimsky District Zheleznogorsk-Ilimsky ⓘ Korshunovskoye iron deposit	Lapis 37 (2)
Murmansk Oblast Kovdorsky District Kovdor Massif ⓘ Kovdor Zheleznyi Mine	Yakovenchuk et al. (2018)
Sweden
Värmland County Filipstad Långban Ore District Långban Mine ⓘ Dolomite dump	Strand (2016)