Larimar

Hardness: 4.5-5 Mohs. Color: Blue, ranging from white-blue to sky-blue to volcanic-blue, often with white streaks or patterns. Luster: Vitreous to silky. Crystal Structure: Triclinic (typically found in massive forms). Cleavage: Perfect on {100} and {001}. Specific Gravity: 2.74-2.88.

Larimar is a rare blue variety of the mineral pectolite, formed from volcanic activity. It is created when hot gases and hydrothermal solutions crystallize within the cavities and fractures of basaltic lava flows. Its distinctive blue color is due to the substitution of cobalt for calcium within the pectolite structure. Geologically, it is relatively young, formed during Miocene epoch volcanic activity, approximately 1 to 5 million years ago.

Predominantly used in jewelry due to its attractive blue color and patterns. It is fashioned into cabochons, beads, and carvings. Also sought after by mineral collectors.

Larimar is exclusively found in one location in the world: the Filipinas Mine in the Los Chupaderos section of the Sierra de Baoruco mountain range, Barahona Province, Dominican Republic. Its name was coined by Miguel Méndez, who combined his daughter's name 'Larissa' with 'mar', the Spanish word for sea, due to its sea-like blue colors. It is also known as the 'Atlantis Stone'.

To identify Larimar in the field, look for its unique pale to deep blue color, often swirled with white, light blue, or greenish areas. It is relatively soft, so it can be scratched with a knife, distinguishing it from harder blue minerals. When tumbled or polished, it exhibits a distinct silky or vitreous luster. Due to its singular origin, finding it naturally outside the Dominican Republic's specific mining area is virtually impossible. Collectors often look for specimens with intense blue color and interesting patterns. Imitations exist, so it's important to be aware of common fakes like dyed howlite or chalcedony. Genuine Larimar will often have a fine, fibrous texture visible under magnification.