Hornblende
Size 3cm
Plus
FREE 925 Silver Chain with every pedant.
Choose from One in picture in 45cm or 55cm.  Or normal 45cm chainlink.
 
'Hornblende is a complex group of minerals called inosilicates. This black amphibole is referred to as a general or field term rather than as a recognised mineral. Igneous and metamorphic rocks often contain hornblende minerals found in abundance. Chain silicate mineral Hornblende is made up of two chains of silica tetrahedrons.
 
It has a hardness of 5–6, a specific gravity of 3.0–3.6, and opaque green, dark green, or black tint. Diamond-shaped in cross-section, it forms slender prismatic crystals or fibrous masses of uneven grains. The amphibole mineral group that includes hornblende is known as the calcium-amphibole group.
 
Some of the most prevalent rock types that contain Hornblende include granite (syenite), diorite (gabbro), basalt (andesite), gneiss (scheiss), and quartz (hornblende). Rather than pyroxene minerals from a hotter magma, it crystallises because of its higher concentration of silica and water.'
 
These are designed and manufactured by hand in a factory that practises sustainability in India.