poikiloblastic

poikiloblastic

[pȯi¦kil·ə¦blas·tik]
(petrology)
Of a metamorphic texture, simulating the poikilitic texture of igneous rocks in having small idioblasts of one constituent lying within larger xenoblasts. Also known as sieve texture.
References in periodicals archive ?
Staurolite commonly forms euhedral poikiloblastic porphyroblasts with elongated prismatic shapes of various aspect ratios (1.2 cm across), which can contain inclusion trails that preserve earlier fabrics.
The hornblende is poikiloblastic and crystals are lineated parallel to the rock foliation.
Biotite gneiss with lepidogranoblastic or poikiloblastic texture and non-laminated crystalline structure consists of feldspar (47%), quartz (35%) and biotite (13%), the rest being accessories.
The existent textures include nematoblastic, granoblastic, porphyroblastic and poikiloblastic. The nematoblastic texture is defined by its preferential orientation of hornblende (Figure 3e).