Related Clues:

• Isinglass, e.g.
• Mineral that forms in sheets
• Isin-glass
• Mineral with basal cleavage
• Mineral involved in much litigation
• Old construction danger
• Mineral noted for its cleavage
• Fire-resistant material dangerous to health
• Boss set a non-burning material up
• Fireproof material, now known to be dangerous
• Fire-resistant material, a danger to health
• Fireproof material, dangerous to health
• Fire-resistant material, injurious to health
• Fireproof substance, dangerous to health
• Fibrous insulation material, dangerous to health