Remarkable Greenstone is a gift from The Stone Prisoner DLC for Dragon Age: Origins. It gives 
(+10) (with diminishing returns) for Shale and (+5) (with diminishing returns) for any other companion.
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Bug! In  downloadable version, only (+5) is gained when given to Shale.
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Acquisition[]
- Dropped from a shade encountered after speaking with Matthias in Village of Honnleath.