Looks like Calcite (white), Hematite or possibly Goethite (black) and Hematite or Goethite converting to Limonite (reddish).
The white could be feldspar (hardness ~6) instead of calcite (hardness 3), a simple hardness test will distinguish the two.
Limonite is not a true mineral it's a mineraloid. It can be various colors of red/orange/brown and is almost always found in direct association with iron minerals like Magnetite, Hematite and Goethite.