Aragonite | Gemopedia

Aragonite's name is derived from the location of Molina de Aragon, Spain, the province where it was first discovered. Aragonite occurs in Agrigento, Sicily, Italy, in the famous sulfur mines, as well as on Mount Vesuvius, Italy. Aragonite specimens are highly prized by mineral collectors for their wide variety of forms, which include twins and pseudomorphs (uncharacteristic crystal forms). As an added bonus, many specimens are fluorescent as well as phosphorescent, a rare occurrence among minerals.
Colors
Colorless, Green, White, Gray, Red, Yellow, Brown, Blue, Violet

Aragonite Classification

Common Name

Aragonite

Species

Aragonite

Variety

Colors

Colorless, Green, White, Gray, Red, Yellow, Brown, Blue, Violet

Alternate Names

Gemstone Groups

Aragonite

Key Separations

RI, birefringence, optic character, SG, cleavage.

Comments

Aragonite effervesces to hydrochloric acid.

Aragonite Optical Properties

Transparency

Transparent - Opaque

Refractive Index

1.53-1.685

Birefringence

0.155

Optic Character

Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Variable
LWUV: Variable

CCF Reaction

Pleochroism

None

Dispersion

Comments

Aragonite Chemistry & Crystallography

Chemical Name

calcium carbonate

Chemical Formula

CaCO3

Synthesis

Crystal System

Orthorhombic

Classification

Carbonate

Nature

Natural

Crystallinity

Crystalline

Comments

Aragonite Characteristic Physical Properties

Hardness

3

Streak

White

Specific Gravity

2.93-2.95 Typical:2.94

Toughness

Varies

Inclusions

Luster

Vitreous

Stability

Poor

Fracture

Subconchoidal, Splintery

Cleavage

Good, in one direction, Poor, in two directions

Comments

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