Gemologist Guide to Identifying Andalusite
Andalusite is a strongly pleochroic gemstone and is highly saught after by lapidary artists because of this unique trait. Pleochroic gems can display different colors when they’re viewed from different directions. Expert cutters can produce beautiful faceted stones that display the gem’s pleochroic colors in the face-up position. These gemstones are most commonly found in […]
Gemologist Guide to Identifying Anglesite
Anglesite is a secondary lead mineral and forms through the alteration of lead sulfides, mainly Galena. These crystals can contain impurities of Galena, giving the specimens a gray-to-black color. In some localities, Anglesite forms as pseudomorphs after Galena, giving the crystals false isometric forms. Some massive Anglesite specimens have gray and black banding present, which […]