History, Location & Origin | Angelite
Angelite, also known as anhydrite or angel stone, is a mineral that's appreciated for its serene, sky-blue color. Its history, primarily geological, is intertwined with its physical properties and the locations where it is found.
Geological Formation and Composition:
- Natural Formation: Angelite is a form of anhydrite, which is a calcium sulfate mineral (CaSO₄). It forms from the dehydration of gypsum, another sulfate mineral.
- Crystal System: Anhydrite crystallizes in the orthorhombic system and typically forms in compact or fibrous aggregates, which can be transformed into the fine-grained, dense form known as Angelite.
Physical Characteristics:
- Color and Texture: Angelite is known for its soft, pale blue color, which can sometimes exhibit white or colorless streaks. Its texture is typically smooth, making it a popular choice for polished stones and carvings.
Historical Context:
- Discovery and Naming: The term "Angelite" is a relatively recent trade name for blue anhydrite, chosen for its heavenly color reminiscent of angels. The mineral anhydrite itself was named in 1804, derived from the Greek word "anhydrous," meaning "without water," in reference.
