marcasite /märˈkə-sīt/

Sulphide of iron in orthorhombic crystals (in the gem trade it can be pyrite, polished steel, etc)

• squanders
• square
• square accounts
• square away
• square B
• square-bashing
• square bracket
• square brackets
• square-built
• square centimetre
• square-cut
• squared
• square dance
• square-dance
• square danced
• square-danced
• square dances
• square-dances
• square dancing
• square-dancing
• squared circle
• squared circles
• square deal
• square deals
• square-eyed