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Alexandrite

Tsarstone collectors guide

American alexandrite

La Madera Mountain is a mine in Rio Arriba County, New Mexico, which is reported to produce occasional small chrysoberyl crystals with weak color change.

Locality details
CountryUnited States of America
RegionNew Mexico
ProvincePetaca District
LocalityLa Madera Mtn.
Latitude35.2228
Longitude-106.3700
Altitude6938
Time zoneUTC-7(-6DT)
Locality maps
MapSatellite
Map of La Madera Satellite of La Madera

The best known pegmatite in New Mexico is the Harding pegmatite dike, well exposed in mine workings east of Dixon, Taos County. Once owned by Dr. Arthur Montgomery and subsequently donated to the University of New Mexico, it was mined over the years for lithium (lepidolite and spodumene), tantalum (microlite and columbite-tantalite), and beryl, (some of which is pink beryl rich in alkali metals and H2O). Other distinctive minerals found at the Harding mine include rose muscovite, fluorapatite, eucryptite and many more. Montgomery (1951) gave an interesting and classic account of the beryl mining, in which three men and a mule produced several hundred tons of hand-sorted beryl per year.

In recent years a number of other pegmatites occurring locally in northern New Mexico have produced minerals, often in well-crystallized form, including beryl, chrysoberyl, gahnite, titanite, epidote, margarite, and schorl, thanks to the diligent efforts of astute and observant collectors such as Ramon DeMark, Jesse Kline, and others.


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Bibliographic details
Page title American alexandrite, La Madera Mountain Mine
Author David Weinberg
Website title Alexandrite Tsarstone Collectors Guide
Date published 03 July 2010 05:13 UTC
Date accessed 18 December 2014 12:29 UTC
Permanent link http://www.alexandrite.net/viewpage.html?id=ALXS-001-00021
AMA style
David Weinberg. "American alexandrite, La Madera Mountain Mine". In Alexandrite Tsarstone Collectors Guide. July 03, 2010, 05:13 UTC. Available at: http://www.alexandrite.net/viewpage.html?id=ALXS-001-00021. Accessed December 18, 2014.
APA style
"American alexandrite, La Madera Mountain Mine". (2010, July 03). In Alexandrite Tsarstone Collectors Guide. Retrieved 12:29, December 18, 2014, from http://www.alexandrite.net/viewpage.html?id=ALXS-001-00021.
Bluebook style
"American alexandrite, La Madera Mountain Mine", http://www.alexandrite.net/viewpage.html?id=ALXS-001-00021 (last visited December 18, 2014).
Bluebook: Harvard JOLT style
See Alexandrite Tsarstone Collectors Guide, "American alexandrite, La Madera Mountain Mine", http://www.alexandrite.net/viewpage.html?id=ALXS-001-00021 (Information about American alexandrite findings and mining in New Mexico, USA.) (as of Dec. 18, 2014, 12:29 GMT).
CBE/CSE style
David Weinberg. "American alexandrite, La Madera Mountain Mine". In Alexandrite Tsarstone Collectors Guide. 2010 Jul 03, 05:13 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2010 Jul 03, 05:13 UTC [cited 2014 Dec 18]. Available from: http://www.alexandrite.net/viewpage.html?id=ALXS-001-00021.
Chicago style
David Weinberg, "American alexandrite, La Madera Mountain Mine", http://www.alexandrite.net/viewpage.html?id=ALXS-001-00021, (accessed December 18, 2014).
MLA style
"American alexandrite, La Madera Mountain Mine". Alexandrite Tsarstone Collectors Guide. 03 Jul 2010, 05:13 UTC. 18 Dec 2014 http://www.alexandrite.net/viewpage.html?id=ALXS-001-00021
MHRA style
David Weinberg, "American alexandrite, La Madera Mountain Mine", Alexandrite Tsarstone Collectors Guide, 03 July 2010, 05:13 UTC, http://www.alexandrite.net/viewpage.html?id=ALXS-001-00021 [accessed 18 December 2014].
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