Same Mineral, Different Crystals
Although the names sound very different, Blue Aragonite and Caribbean Calcite are very similar materials, and often mis-labeled as one or the other. They have been described as trade names for the same material, which is incorrect. My hope here is to bring some clarification to the identification of these two minerals.
Polymorphs
The cause for this confusion, no doubt, is because both crystals form from the same mineral – calcium carbonate. This phenomenon is called a “polymorph” – the ability of a solid material to form in more than one crystalline structure.
Let’s look at the differences between these crystals.
How to Identify Caribbean Calcite
Of the two, this is the more common variation of calcium carbonate. Caribbean Calcite exhibits a lighter ocean blue color, for which it is named. This material comes exclusively from Pakistan, and has a larger crystal structure, resulting in a “softer” overall appearance. In the samples I have obtained it also exhibits a bit more transparency. For more detailed information I would suggest referencing Mindat.org
How to Identify Blue Aragonite
This variation of calcium carbonate is lesser known of the two. It is darker in color, and exhibits a finer, more fibrous appearance than it’s Calcite counterpart. It is overall a bit rougher in texture, and polished pieces will exhibit copious amounts of “drusy caves,” or small voids or pockets lined with fine crystalline points. This material is also found in Pakistan, as well as Morocco, China, Greece and Mexico. For more detailed information I would suggest referencing Mindat.org
How Does One Mineral Create Two Different Crystals?
Quite simply: environmental conditions. Different levels of heat and pressure will yield different colorings and crystalline structures. And Calcite/Aragonite are not the only minerals we see this in. Other minerals this phenomenon has been observed in includes Graphite/Diamonds (both made of carbon), kyanite/sillimanite/andalusite (from Aluminum Silicate), and quartz, which actually forms SIX polymorphs. For more information click here
In Summary…
Caribbean Calcite and Blue Aragonite are different crystals, made from the same mineral. As they are exposed to different environmental conditions, they form into different crystals with different coloring in a phenomenon known as polymorphism. While the two names are trade names, they are for different materials.
Do you have either of these beautiful crystals in your collection? Share your experience below! 👇
Looking for Blue Aragonite or Caribbean Calcite crystals? Our stock is always changing; check our current inventory HERE
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