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A rough specimen of bloodstone. Heliotropes (from Ancient Greek ἥλιος (hḗlios) 'sun' and τρέπειν (trépein) 'to turn') (also called ematille, Indian bloodstones, or simply bloodstones) are aggregate minerals, and cryptocrystalline mixture of quartz that occurs mostly as jasper or sometimes as chalcedony (translucent).
A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized rugose coral, Hexagonaria percarinata. [1] Such stones were formed as a result of glaciation, in which sheets of ice plucked stones from the bedrock, grinding off their rough edges and depositing them in the northwestern (and some in the northeastern) portion of Michigan's lower peninsula.
The coral referred to in the Bible is the precious coral (Corallium rubrum), the formation of which is a calcareous secretion of certain polyps resulting in a tree-like formation. Presently coral is found in the Mediterranean , the northern coast of Africa furnishing the dark red, Sardinia the yellow or salmon-colored, and the coast of Italy ...
Orbicular jasper from Madagascar. Orbicular jasper is a variety of jasper which contains variably-colored orbs or spherical inclusions or zones. In highly silicified rhyolite or tuff, quartz and feldspar crystallize in radial aggregates of needle-like crystals which provide the basis or seed for the orbicular structure seen in this kind of jasper. [1]
Precious coral, or red coral, is the common name given to a genus of marine corals, Corallium. The distinguishing characteristic of precious corals is their durable and intensely colored red or pink-orange skeleton , which is used for making jewelry .
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Eagle Eye zooanthid coral, propagated in captivity. Zooanthids and Palythoa are propagated in captivity by cutting the polyps apart using a scalpel or scissors then attaching to a surface with cyanoacrylate glue. Care must be taken when cutting zooanthids because if the palytoxin gets in the bloodstream a person will become very ill.
Popcorn can also occur on concrete structures outside the cave environment; these are classified as calthemite coralloids. Calthemite coralloids also occur in "artificial caves", such as mines, railways, or vehicle tunnels where there is a source of lime, mortar, or cement from which the calcium ions can be leached.