Material: Metal alloy with 20% silver (no blacken, antiallergic). Total lenght: 40cm (1.64 feet). Pendant: 52 x 38 x 6mm (2.1 x 1.5 x 0.4). Diameter of the beads: 4-6mm (0.2 - 0.3).Total weight: 38 grams (1.3 oz). Chemistry: Na2(Ti, Fe)Si4(O, F)11, Sodium Titanium Iron Silicate Fluoride. Uses: Only as mineral specimens and cut as gemstones for gemstone collectors. Narsarsukite is not a well known mineral, but it is a nice collection mineral.
It is named for the wonderful mineral locality at Narsarsuk, Greenland, from where the first specimens were described in 1900. The locality is the result of agpaitic pegmatite intrusions, an unusual igneous rock that is high in alkaline metals (such as sodium) and poor in silica. These intrusions also contain a large number of unusual elements such as titanium, fluorine and rare earth metals. Narsarsukite has been cut as a gemstone, although do not expect to see it available in many jewelry stores.
It is cut mostly for gemstone collectors, but is considered attractive. Color is various shades of yellow, green, pink and brown as well as colorless. Luster is vitreous or adamantine to dull or greasy.Transparency: crystals are transparent to translucent. Crystal Habits include tabular and prismatic crystals often arranged into sprays and parallel aggregates. Cleavage is perfect in two directions (prismatic) and good in one direction (basal). Fracture is uneven to subconchoidal. Hardness is 6 - 7.
Specific Gravity is approximately 2.6 to 2.8. Other Characteristics: Index of refraction: 1.601 - 1.614 and 1.632 - 1.647. Associated Minerals are quartz, microcline, albite, amphiboles, carletonite, lorenzenite, calcite, leucosphenite, natrolite and aegirine.Best Field Indicators: Crystal habit, cleavage, color, associations and localities. The item "Fantastic mineral called Narsarsukite. Northern Karelia, Russia" is in sale since Sunday, January 14, 2018. This item is in the category "Jewelry & Watches\Fashion Jewelry\Body Jewelry\Body Chains". The seller is "rus_treasures" and is located in Russia.
This item can be shipped worldwide.