euhedral


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euhedral

[yü′hē·drəl]
(petrology)
References in periodicals archive ?
The first generation of barite in the caves and veins of carbonate rocks in the Kalana sequence occurs as euhedral bladed-tabular (rhombic) barite crystals and crystal aggregates growing on the limestone-dolomite wall-rock (Fig.
5C), the rocks contain euhedral epidote of possibly igneous origin.
Los cristales mas grandes presentaron inclusiones de esfalerita con cristalizacion subhedral a anhedral, mayoritariamente, aunque tambien se presenta en forma euhedral en menor proporcion.
2, 3, 5E-F), the spherulitic part of the microstructure is no longer observable, and an equigranular mosaic of sub-euhedral and locally euhedral calcite crystals become recognizable in the middle sector of the rostra, which are the product of transversally cut prismatic calcite crystals (that is, perpendicular to the c-axis).
Therefore, the thermal decomposition scenario for the formation of those large, euhedral, chemically-pure, [111]-elongated magnetites found within Ca-, Mg- and Fe-rich carbonates of the Martian meteorite ALH84001 is not plausible and the biological origin cannot be ruled out.
without a spicule) consisted of euhedral prismatic bipyramidal crystals (Figure 23, right).
The plagioclases are euhedral to subhedral that show evidences of fracture and breakage.
The presence of euhedral zircon and hornblende (Plates 2 to 6) indicate that ash falls have contributed to this sandstone.
One is in the form of subhedral to euhedral crystals and second is in the form of intraclasts of dolomite.