What is required to measure the hardness of a pearl?
lamphreys Playing with it Scratching it keratin melanin content potassium magnesium Helping it
A B C D E F G H
Carbonate minerals, such as malachite, pearl, and rhodochrosite, are damaged by chemical attack.
measuring the hardness of a pearl requires scratching it
What is required to measure the hardness of a pearl? (A) lamphreys (B) Playing with it (C) Scratching it (D) keratin (E) melanin content (F) potassium (G) magnesium (H) Helping it