Polished up, these are Apache Tears tumbles. Apache tears is an USA / Mexico obsidian that is gentler than standard black obsidian. So it suits the more energetically sensitive who want obsidian’s help but know others forms are too strong. It is probable gentler as it grows in a delicate white mica matrix.
This crystal moves excess energy down into the Earth chakra so you ground better with the planet. Many find it comforting, a gentle support when you are grieving. It also helps clear stuck energy and patterns from trauma.