In the sixth zone, an abrupt change to greyish pumice is encountered, and no crystals are seen.
The colour of the gypsum is normally greyish, and in-hand specimens of the gypsum contain large and clearly visible crystals.
The soil was a deep, montmorillonitic clay, dark greyish brown in colour and slightly alkaline.
In recognizing a substance as whitish or greyish, the brain adjusts to the ambient lighting environment.
His third painting was a still life, mainly grey and greyish green.
The green pericarp encloses an edible seed; this outer coat dries and hardens to a greyish-brown at maturity.
Each cycle consists of medium to thick interbedded yellowish grey sandstone (15-75 cm) and blue to greyish mudstone beds (15-60 cm).
In one arrangement, dark brownish, greyish or greenish masses of fungal hyphae enclose groups of algal cells.
