Maxwellite (original) (raw)

A valid IMA mineral species

About MaxwelliteHide

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Lustre:

Vitreous, Sub-Vitreous

Crystal System:

Monoclinic

Name:

Named by Eugene E. Foord, Paul F. Hlava, Joan J. Fitzpatrick, Richard C. Erd, and R. W. Hinton in honor of Charles Henry Maxwell (9 July 1923 – 29 May 2000 Denver, Colorado), geologist and mineralogist with the U.S. Geological Survey, who studied the Taylor Creek district.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2605:1

d2bf865b-5aa2-4932-88a8-feb8f62c3b0e

IMA Classification of MaxwelliteHide

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Classification of MaxwelliteHide

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8.BH.10

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1

41.5.5.3

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq

22.1.21

22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of MaxwelliteHide

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Streak:

Pale red-orange to red-orange

Cleavage:

Distinct/Good
{110}

Fracture:

Irregular/Uneven

Density:

3.90 g/cm3 (Measured) 3.95 g/cm3 (Calculated)

Optical Data of MaxwelliteHide

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RI values:

_n_α = 1.748 _n_β = 1.772 _n_γ = 1.798

2V:

Measured: 86° to 89°, Calculated: 90°

δ = 0.050

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

Comments:

X=Y= medium yellow-orange; Z= dark orange-red.

Chemistry of MaxwelliteHide

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Mindat Formula:

NaFe3+(AsO4)F

Crystallography of MaxwelliteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 7.16 Å, b = 8.78 Å, c = 6.68 Å
β = 114.58°

Ratio:

a:b:c = 0.815 : 1 : 0.761

Unit Cell V:

381.88 ų (Calculated from Unit Cell)

Morphology:

Slightly elongated to blocky crystals.

Forms on type material: {013}, {526}, {526}, {011}.

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Original description

Geological EnvironmentHide

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Type Occurrence of MaxwelliteHide

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General Appearance of Type Material:

Red aggregates to 3 mm and as blocky to short prismatic euhedral to subhedral crystals up to 1 mm long.

Place of Conservation of Type Material:

National Museum of Natural History, Washington, D.C., USA, 166613.

Geological Setting of Type Material:

Formed as a rarity in miarolitic cavities in rhyolite adjacent to high-temperature veins in a hydrothermal tin deposit.

Associated Minerals at Type Locality:

Synonyms of MaxwelliteHide

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Other Language Names for MaxwelliteHide

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Relationship of Maxwellite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of MaxwelliteHide

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Other InformationHide

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Notes:

Slowly soluble in HCl and HNO3, and readily soluble in hot H2SO4.

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 MaxwelliteHide

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References for MaxwelliteHide

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Reference List:

Foord, E.E., Hlava, P.F., Fitzpatrick, J.J., Erd, R.C., and Hinton, R.W. (1991) Maxwellite and squawcreekite, two new minerals from the Black Range tin district, Catron County, New Mexico, U.S.A. Neues Jahrbuch für Mineralogie, Monatshefte, 363–384.

Localities for MaxwelliteHide

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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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