Nyerereite is not stable in nature when comes in contact with the atmosphere and immediately breaks down into the small tabular crystal
. With the fact that nyerereite is a form of calcium carbonate mineral with chemical formula Na2Ca(CO3)2, and it's by-product value prominently high in chemical industry.
Among the amazements in the Spanns' case was a totally gemmy, lusciously deep orange grossular crystal 2.5 cm in diameter from Eden Mills, Vermont, and a fantastic matrix specimen of Madagascar pezzottaite, with a central, bright pink, tabular crystal
about 5 cm across.
Barite mineralization in Kalana occurs in two generations--euhedral bladed-tabular barite zonal crystals from a few to 10 cm in size, growing on the limestone-dolomite wall-rock (generation I), and sparsely placed thin tabular crystals
a few millimetres thick and up to 1 cm in size, growing on calcitic crusts (generation II).
The platy and tabular crystals
of drug were seen entangled with lauric acid crystals show the entrapment of acicular and platy crystals of drug in fatty acid (myristic acid, palmitic acid, and stearic acid) matrix (Figure.
with both cube and tetrahexahedron faces are rare.
However, at high magnification it became evident that these were not single crystals, but layers of polyhedral plates resembling tabular crystals
, which formed lamellar-like stacks (Fig.
It forms hexagonal, thin to thick tabular crystals
to about 200 [micro]m.
The crystals tend to be rather elongated in comparison to the more tabular crystals
from the Mowbray mine.
The tabular crystals
, several of which are twinned, have been identified by their crystal morphology and by chemical analysis (B.
Linear crystals in radial habits and tabular crystals
in rosette habits both reflect conditions of rapid crystal growth from highly supersaturated solutions.
Gemmy lime-green fluorite forms slightly rough dodecahedral crystals to 5 cm on glittering matrix composed of snowy white crests of parallel albite ("cleavelandite") crystals shot through with sleek, striated crystals of jet-black schorl; on other pieces, translucent pink apatite-(CaF) (formerly known as fluorapatite) forms lustrous tabular crystals
to 7 cm, in parallel aggregates resting lightly on the same albite/schorl matrix.
But summer of 2007 saw a discovery in a quarry near the town of Jalna (southeast of Jalgaon) which produced flat matrix plates 4 to 15 cm across with very thin, colorless, transparent, tabular crystals
of barite, uniformly around 1.5 cm, rising at varying angles from drusy colorless apophyllite: Dr.