Assertion: gem tourmaline | /r/AtLocation | pegmatite core zones
Facets:
value: with clevelandite
type: OTHER
value: with more rarely amblygonite
type: OTHER
value: with spodumene
type: OTHER
value: usually
type: TEMPORAL
value: with lepidolite
type: OTHER
value: with muscovite
type: OTHER
value: with quartz
type: OTHER
Source sentences:
text: The light coloured gem tourmalines are much more rare, usually occuring in pegmatite core zones with quartz, clevelandite, muscovite, lepidolite and more rarely amblygonite and spodumene.