### substance | mineral:

Calcite
* Most calcites contain calcium
  - form major features
* Note the rhombohedral cleavage.
* Some calcites neutralize water.
* also occur as fibric aggregates, as coarse to fine grained aggregates or stalactitic.
* are calcium carbonate
  - pink at the base turning yellow towards termination
  - spars
* begins to dissolve when carbonic acid from rainwater comes in contact with it.
* calcium carbonate mineral, polymorphous with aragonite
  - compound
* can be white, colorless, or pale shades of gray, yellow, and blue
  - coexist with talc only under extremely restricted conditions
* exhibits several twinning types adding to the variety of observed forms.
* fizzes in HCl
  - a weak acid solution
  - dilute hydrochloric acid
  - readily in hydrochloric acid
  - strongly when acid is applied
* fluoresces orange under UV illumination
  - orange, willemite fluoresces green under UV illumination
* form features
* form of calcium carbonate
  - limestone quarried under sanitary conditions
* has a perfect rhombohedral cleavage that is the result of the crystal structure
  - an important environmental impact
  - brown limonite surface staining
  - numerous uses as a neutralizer of acids
* has the same chemical composition as aragonite, but has a different crystal structure
  - composition as aragonite, but a different crystal structure
  - two cleavage planes
* helps form the shells and hard exteriors of oysters, sea stars, and sand dollars.
* induces amplification of ones energy field.
* is almost fully covalent, halite is ionic, but quartz is almost equally covalent and ionic.
* is also a common mineral in hytdrothermal veins
  - the main component of Chalk, which is processed as drawing chalk
* is an adherent mineral that attaches itself to the surface of the heat exchanger
  - important constituent of calcareous marls and calcareous sandstones
  - opaque white stone that is often times called alabaster
  - commonly present in the veins
  - harder than gypsum, however, because it has a higher number
  - hexagonal, and aragonite is orthorhombic
  - indispensable in the construction industry, forming the base of cement
  - one of the commonest minerals in the crust of the Earth
* is one of the most abundant and widespread minerals in Kentucky
  - common and widespread minerals
  - such mineral
  - polymorphic to aragonite
  - quite a common mineral, yet desirable for collectors
  - so soft that it can be scratched by a penny
  - soft enough so it can be easily worked yet dense enough to take a nice polish
* is the main ingredient in limestone, and in Portland cement
  - material that forms stalactites and stalagmites in caves
  - more stable and more common of the two
* is the most abundant carbonate in freshwater environments
  - mineral locally
  - common and widely occurring species of the carbonate mineral class
  - one of the most common minerals on earth
* is the primary mineral component in cave formations
  - in metamorphic marble
* is the principal constituent of limestone and marble
  - mineral in limestone, chalk, and marble
* is the principle component of limestone, marble, and seashells
  - mineral in limestones and marble
  - truly one of the best collection type minerals
  - uncommon, but occurs as rare twinned rhombohedrons or as pink cleavage fillings
  - used as an acid neutralizer in the chemical industry
* is very common locally
  - near saturation in sea water and so is used as shells material by marine organisms
  - widespread in the mines and prospects of the Upper Mississippi Valley zinc-lead district
* major sedimentary rock forming mineral in marine environments.
* makes up two well known rocks limestone and marble.
* mineral but since it is secreted by animals to form shells it is inorganic
  - which bubbles when placed in an acid such as vinegar
* naturally occurring birefringent crystal.
* occurs at similar or lower concentrations.
* often appears as twinned crystals
  - forms the matrix or substrate for aesthetic specimens
* primary component of many marine organisms.
* relatively soft mineral that breaks easily.
* sometimes forms lily pads or cave rafts on standing pools of water
  - is associated and inclusions of cacoxenite are common
* tends to be preserved under more corrosive conditions in tropical sediments
  - remain long after all of the aragonite has dissolved away
* translucent stone.
* very common mineral and the main mineral in limestone