Aragonite (Ar) and Calcite (Cc) runs 2 are the closest to the diagenetic front and initial recrystallization stage. B) Graph indicating average concentrations of the 3 elements. The Ca analogue of strontianite. In thin section, the fibrous clusters plus the overall coral structure that includes the radiating septa (solid walls separating the cavities) are useful identifiers. This polymorphic reaction causes an 8% increase in bulk volume, which results in a loss of porosity. The principal member of the Aragonite Group, aragonite is the second most common polymorph of natural calcium carbonate (the most common is calcite).It is significantly less widespread and abundant than calcite and is formed under a much narrower range of … Aragonite Crystallography: Axial Ratios: a:b:c =0.6223:1:0.7205 : Cell Dimensions: a = 4.959, b = 7.968, c = 5.741, Z = 4; V = 226.85 Den(Calc)= 2.93 Modern bryozoans consist of high Mg calcite, aragonite, or both as microscopic and submicroscopic crystals. In thin section Aragonite is distinguished by its high birefringence, showing high order white interference colors, its biaxial character with a 2V of about 18 o, and extinction parallel to the {010} cleavage. Aragonite is unstable in the subsurface, where it reverts to the hexagonal isomorph calcite. Aragonite Group. A) Thin section image of laser ablation transect locations. Ar and Cc runs 1 are further from the transition zone.
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