We had samples of this new find from Indonesia tested at EPI (Institut für Edelsteinprüfung). The examination of Dipl.Mineraloge Bernhard Bruder showed that the examined rock is Nephrite. In contrast to other localities (e.g. Canada) only the iron content is clearly lower. This indicates that this type of Nephrite is a finely matted aggregate of Tremolite, the iron-free or iron-poor variety of Actinolite. Both minerals form a mixed series, so that there can be Nephrite with different iron content, depending on whether the tremolite portion predominates, or just the actinolite portion. Nephrite is defined as a finely divided aggregate of the mentioned minerals.
Mineralogically the examined material is a tremolite rock with chromite inclusions; in the trade it is also called New Zealand jade, Maorijade or Nefrit.
The modern stone medicine according to Michael Gienger knows Nephritjade as a stone for the inner balance, which can help with indecision and doubts.