Larimar

Source: Wikipedia, the free encyclopedia.
Not to be confused with Lorimar.
Larimar (Blue Pectolite)
2V angle
Measured: 50° to 63°, Calculated: 42° to 60°
Dispersionr > v weak to very strong
References[1][2][3]

Larimar is the tradename for a rare blue variety of the silicate mineral pectolite found only in the Dominican Republic, around the city of Barahona.[4] Its coloration varies from bluish white, light-blue, light-green, green-blue, turquoise blue, turquoise green, turquoise blue-green, deep green, dark green, to deep blue, dark blue and purple, violet and indigo and the larimar can come in many varieties and color mixes.[5][6]

History

The Dominican Republic's Ministry of Mining records show that Father Miguel Domingo Fuertes Loren of the

Barahona Parish requested permission on 22 November 1916 to explore and exploit the mine of a certain blue rock that he had discovered. Pectolites were not yet known in the Dominican Republic, and the request was rejected.[6][7]

Miguel Méndez and

alluvial sediment, washed into the sea by the Bahoruco River. An upstream search revealed the in situ outcrops in the range and soon the Los Chupaderos mine was formed.[6][7]

Geology

Rough Larimar

Larimar is a type of pectolite or a rock composed largely of pectolite, an acid silicate hydrate of calcium and sodium. Pectolite is found in many locations, but larimar has a unique volcanic blue coloration, which is the result of copper substitution for calcium.[8]

volcanic rocks, andesites and basalts, erupted within the limestones of the south coast of the island. These rocks contained cavities or vugs which were later filled with a variety of minerals, including the blue pectolite. These pectolite cavity fillings are a secondary occurrence within the volcanic flows, dikes, and plugs. When these rocks erode, the pectolite fillings are carried down the slope to end up in the alluvium and the beach gravels. The Bahoruco River carried the pectolite-bearing sediments to the sea.[6] The tumbling action along the streambed provided the natural polishing to the blue larimar, which makes them stand out in contrast to the dark gravels of the streambed.[7]

Los Chupaderos

The most important

Barahona in the southwestern region of the Dominican Republic. It is a single mountainside now perforated with approximately 2,000 vertical shafts, surrounded by rainforest vegetation and deposits of blue-colored mine tailings.[6][7]

Jewelry

Larimar jewellery is offered to the public in the Dominican Republic, and elsewhere in the Caribbean as a local speciality. Most jewellery produced is set in silver, but sometimes high-grade larimar is also set in gold.

Quality grading is according to coloration and the typical mineral crystal configuration in the stone. Larimar also comes in green and can have red spots, brown strikes, etc., due to the presence of other minerals or oxidation. The more intense the blue colour and the contrast in the stone, the higher and rarer is the quality. The blue colour is photosensitive and fades with time if exposed to too much light and heat.[7]

See also

References

  1. ^ Handbook of Mineralogy
  2. ^ Mindat w/ localities
  3. ^ Webmineral
  4. ^ "Larimar". www.mindat.org. Retrieved 2022-06-16.
  5. ^ "Larimar Jewel Texture on Light Surface Background. Stock Image - Image of backdrop, white: 213753779".
  6. ^ a b c d e Woodruff, R.E., 1986. Larimar, beautiful, blue and baffling. Lapidary Journal, 39(10), pp.26-32.
  7. ^ a b c d e Woodruff, R.E. and Fritsch, E., 1989. Blue pectolite from the Dominican Republic. Gems & Gemology, 25(4), pp.216-225.
  8. ^ Kloprogge, J.T., Wood, B.J. and Desk, S., 2016. X-ray Photoelectron Spectroscopy study of so-called “Larimar”, blue pectolite from the Dominican Republic. SDRP Journal of Earth Sciences & Environmental Studies, 1(2). pp.58-67.

External links

Wikimedia Commons has media related to Larimar.
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