Acetamide (organic compound and rare mineral) Acetamide Acetamide (CH3CONH2) is an organic amide used in synthesis and industry; it also occurs as a rare colorless crystalline mineral, typically on shale. This article covers its propert…
Alexandrite: the color-change chrysoberyl gemstone Alexandrite Alexandrite is a rare variety of chrysoberyl noted for its dramatic color change under different light sources; valued in jewelry and collected for its rarity and gemological inter…
