Examples: MINERALS STREAK COLOR Calcite White Feldspar Colorless Galena Lead Gray Graphite Steel Gray Gypsum (when available) White Halite White Hematite Reddish-Brown Quartz C1ear Sulfur White Talc White HARDNESS ACTIVITY Students can try to determine hardness of different rocks and minerals by scratching them with different objects very soft rocks can be scratched with the fingernail.
(Gray Graphite Steel Gray Gypsum; [is] Lead [of]; STREAK COLOR Calcite White Feldspar Colorless Galena)
Gray Graphite Steel Gray Gypsum
[is] Lead [of]
STREAK COLOR Calcite White Feldspar Colorless Galena