I need help with earth science - identifying minerals plz?

Question

Please helping me identifying properties of minerals

Mineral 1 has the following properties: The luster is non-metallic - viterous; the hardndess is less than 4; the color is black, but the streak is white to light gray; the mineral has one perfect cleavage - basal, and the cleavage fragments form thin sheets that are flexible and elastic. The identity of Mineral is?

Mineral 2 has the following properties: The luster is non-metallic - dull; the hardness is less than 5.5 and it is even sloppery (greasy feel) when you rub your fingers across it; it has no visble cleavage; and the color and streak are pure white. The identity of Mineral is?

Mineral 3 has the followinng properties: The luster is brightly metallic one freashly broken surfaces, but after a year or so the surfaces oxideize in the air to gt a opaque yellow to tan tarnsh on them; the color of the fresh surface is golden yellow, but the streak is a greenish black color; the minteral is easily scratched. The mineral is?

Answer 1

If this is a homework assignment it would have been easier to just do the work especially since these are common minerals.  I take it you don't actually have a specimen to look at.

1 Muscovite a Mica. A silicate

2.Talc  a complex silicate is the best fit even though the hardness is 1 Gypsum is 2 and Opal is 5-6 and a long shot but fits the hardness better.

3. Pyrite An Iron Sufide

Answer 2

Mineral 1 is biotite, mineral 3 sounds like pyrite if it smells like sulfur when you do the streak test it more than likely is.  Mineral 2 sounds like talc but talc is very soft.

Mineral 1 has to be biotite, biotite is black/green with a gray streak, muscovite is white with a white streak.  Opal is too hard to be mineral 2 so the next best guess is gypsum although gypsum has 3 planes of cleavage.