calcitic

It is the only known scleractinian so far to have an entirely calcitic skeleton.

Periphyton is the basic building block of marl, a calcitic mud.

They have calcitic inarticulated shells that are subcircular in outline.

Yet it also contains exuberant and partially intergrown calcitic deposits.

It holds the calcitic plates of echinoderm skeletons together.

It is a very monotonous sequence of calcitic sandstones and black schists.

It also absorbs calcium from water, which adds to the calcitic composition of the marl.

Some ammonites have been found in association with a single horny plate or a pair of calcitic plates.

Instead, the skeleton is primarily calcitic - a type rarely if not ever seen in extant scleractinia.

The machaeridians are characterized by having serialized rows of calcitic shell plates.

Where periphyton grows, the soil develops into marl, which is more calcitic in composition.

The mineralogic composition of carbonate platforms may be either calcitic or aragonitic.

The deposition of calcitic sediments is indicative of a climate with high evaporation rates.

Only the calcitic scleretomes ("armour plates") of these worms tend to be preserved in the fossil record.

Its internal microstructure is calcitic and semi-nacreous.

Hederellids are extinct colonial animals with calcitic tubular branching exoskeletons.

Calcitic fossilization is an unusual feature.

Coelosimilia is similar to modern-day scleractinians, except for the composition of its calcitic, non-aragonitic skeleton.

Modern-day scleractinian corals have skeletons composed of aragonite, a calcitic mineral.

Upland forest on calcitic soil.

They have lamellar calcitic shells, usually with pseudopunctae or punctae and a bulb-like origin.

The calcitic shell is situated beneath the hinder part of the shield, and is perceptible through the skin.

The room is followed by a narrow corridor formed by the wall and giant calcitic concretions, which ends with a stack of 32 metres.

In the construction trade, the term "marble" is used for any massive, crystalline calcitic rock (and some non-calcitic rocks) useful as building stone.

Whether ooids become calcitic or aragonitic can be linked to strontium/calcium substitution within the crystalline structure.