The mineralization is in boulders and outcrop as pegmatoid
calcsilicates and as late cross cutting veins (massive pitchblende and calcite).
The granites are mainly massive, pegmatoid
texture is common, gneissic varieties are rare, while porphyraceous texture occurs very seldom.
and gabbroid layers in Jurassic Preakness and Hook Mountain basalts, Newark Basin, New Jersey.
Sagtjarn Deposit - The mineralisation occurs in biotite-rich acid pegmatoid
veins, sheets and 'knots' cutting across gently northwesterly plunging, open synformal folded meta-argillite gneisses.