Gabrielite is a sulfosalt mineral species occurring as idiomorphic crystals commonly found in cavities of a Triassic dolomitic rock.
3.
The former case is said to be idiomorphic ( or " automorphic " ); the latter is xenomorphic.
4.
When the smaller idiomorphic crystals of the first-formed are scattered irregularly through the larger and less perfect crystals of later origin, the structure is said to be "'poikilitic " '.
5.
Some syenogranite contain rare idiomorphic amphibole ( Fe-hornblende and Fe-edenite ), biotite ( annite 25 %-35 % ), plagioclase ( An 3 ), along with K-feldspar and quartz . ( Mafti, 2001 ).
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