Specific Gravity -4 types: 2.65, 2.89, 3.05, 3.32 -25ml/bottle - ... under 2 are considered light, between 2 and 4.5 average, and greater than 4.5 heavy. Most minerals with a metallic ... a mineral because of impurities present in the mineralsstructure. Four types: 2.65, 2.89, 3.05, 3.32Capacity: 25ml/bottleOut ...