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There are multiple different rocks that begin with O such as the following

  • obsidian
  • old red sandstone
  • oligocence
  • oligoclase
  • Olivenite
  • olivine
  • ONYX (this one is common)
  • Oolite
  • ooze
  • OPAL (this one is common as well)
  • Ophite
  • Ore
  • Ordovician
  • Orpiment
  • Orthite
  • Orthoclase
  • Oxford Clay
  • OXIDE
  • Outcrop
  • Ozokerite
  • Ozocerite (they are different- confusing right???)
  • Orthorhombic
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Wiki User

12y ago

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