This specific very beautiful collectible piece of Black Tourmaline crystals on base of feldspar. Nice and decorative large specimen of 155 x 99 x 105 mm has a perfectly balanced combination of black Tourmaline sticks and pointed feldspar, the cluster is undamaged, with good clarity, and a nice luster.
Specimen reference : CL-TOURM024BL-002-306
Weight: 1218 g
Approx Size155 x 99 x 105 mm Since Rough gemstones have irregular shapes, the sizes depend on placeofmeasurement, those sizes are taken according tou ourpersonal opinion to indicate sizes for you as a customer
Tourmaline isstrongly pleochroic, which means that it can show different colors in different crystal directions. One of tourmaline's pleochroic colors is typically much darker than the other. In addition, many tourmalines absorb more light down the length of the crystal than across it.
Feldspar is the name given to a group of minerals distinguished by the presence of alumina and silica (SiO2) in their chemistry. This group includes aluminum silicates of soda, potassium, or lime. It is the single most abundant mineral group on Earth. They account for an estimated 60% of exposed rocks, as well as soils, clays, and other unconsolidated sediments, and are principal components in rock classification schemes. The minerals included in this group are the orthoclase, microcline and plagioclase feldspars.
