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|System:||Monoclinic||Hardness:||5 - 5½|
|Name:||After Charles Henry Maxwell (1923– ), geologist with the U.S. Geological Survey, who studied the Taylor Creek district.|
Classification of Maxwellite
|IMA status:||Approved 1987|
|Strunz 8th edition ID:||7/B.25-55|
|Nickel-Strunz 10th (pending) edition ID:||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
|Dana 8th edition ID:||220.127.116.11|
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq
|Hey's CIM Ref.:||22.1.21|
22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride
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Type Occurrence of Maxwellite
|Type Locality:||Squaw Creek Mine, Taylor Creek Tin District (Black Range Tin District), Sierra Co., New Mexico, USA|
|Year of Discovery:||1987|
|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:|
Physical Properties of Maxwellite
|Hardness (Mohs):||5 - 5½|
Crystallography of Maxwellite
|Cell Parameters:||a = 7.16Å, b = 8.78Å, c = 6.68Å|
β = 114.58°
|Ratio:||a:b:c = 0.815 : 1 : 0.761|
|Unit Cell Volume:||V 381.88 Å³ (Calculated from Unit Cell)|
Optical Data of Maxwellite
|RI values:||nα = 1.748 nβ = 1.772 nγ = 1.798|
|2V:||Measured: 86° to 89°, Calculated: 90°|
|Maximum Birefringence:||δ = 0.050|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Surface Relief:||Very High|
|Dispersion:||r > v strong|
Chemical Properties of Maxwellite
|Essential elements:||As, F, Fe, Na, O|
|All elements listed in formula:||As, F, Fe, Na, O|
Relationship of Maxwellite to other Species
|Series:||Forms a series with Durangite (see here)|
Forms a series with Tilasite (see here)
|Member of:||Tilasite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Maxwellite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Maxwellite
Foord, E.E., P.F. Hlava, J.J. Fitzpatrick, R.C. Erd, and R.W. Hinton (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. (2) (1992).
American Mineralogist: 77: 449 (abstract).
Cooper, M.A. and F.C. Hawthorne (1995) The crystal structure of maxwellite. Neues Jahrbuch für Mineralogie, Monatshefte, 97–104.
New Minerals (1997), New Minerals 1990-1994.
Internet Links for Maxwellite
Localities for Maxwellite
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.