SKU: 31909625551

Aragonite and calcite with pocket of calcite rhombs

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Description

Aragonite and calcite with pocket of calcite rhombsLocale: Sidi Ayed, Fs Mekns Region, Morocco Approx dimensions: 3. 5 x 2 x 2" Approx size: 425g (0. 9 lb) Calcite and aragonite are polymorphs of one another, meaning that the same chemical composition (calcium carbonate) has crystallized into different crystal structures (trigonal and orthorhombic, respectively). Calcite and aragonite often grow together, and the two minerals are also frequent paramorphs of one anothera pseudomorph of the same

Locale: Sidi Ayed, Fès-Meknès Region, Morocco

Approx dimensions: 3.5 x 2 x 2"

Approx size: 425g (0.9 lb)

 

Calcite and aragonite are polymorphs of one another, meaning that the same chemical composition (calcium carbonate) has crystallized into different crystal structures (trigonal and orthorhombic, respectively). Calcite and aragonite often grow together, and the two minerals are also frequent paramorphs of one another—a pseudomorph of the same chemical composition and retaining the original crystal shape but with different crystal structure, created through a change of conditions such as heat or pressure. There is understandably some confusion distinguishing what is calcite, versus aragonite, or a paramorph, or some hodgepodge of all of the above.

Which is all to say, this specimen falls somewhere in that ‘hodgepodge’ category. The matrix is partially calcite, and rhombohedral patterns can be seen in places. It appears aragonite formed over calcite points on the top which then partially or wholly dissipated, leaving some of the aragonite points hollow. There is a small pocket on the back of the piece filled with small white calcite rhombs.

UV reactivity The aragonite will give a moderate reaction under 365 nm UV light, fluorescing a light taupe color. The calcite will stand out in comparison, fluorescing a strong peachy-red color.

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SKU: 31909625551

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4.2 ★★★★★
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Roxanne
West Palm Beach, US
★★★★★ 5
Get them for sure
Color: 9 in 500 White
I order paper plates all the time and these paper plates are very good they’re strong they’re so thick they look great and I’ll order them again I do however wish the price point a bit better it is not outrageous though.
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Reviewed in the United States on September 5, 2025
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Tom Sugden
Omaha, US
★★★★★ 5
Great plates
Color: 10 in 500 White
Was sick of buying 50 plates at a time from the grocery store all the time. These are durable, not thin or flimsy like most. Even moist food wont leak through. Good stuff
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Reviewed in the United States on April 22, 2026
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FCT
Belleville, US
★★★★★ 4
FCT
Color: 10 in 500 Nature
Great
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Reviewed in the United States on March 29, 2026
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tyler Whille
Charlottesville, US
★★★★★ 5
Home stuff
Color: 10 in 500 Nature
These are great plates.. good for 3-4 months at a time..
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Reviewed in the United States on January 1, 2026
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Cathi Anne
Waukegan, US
★★★★★ 5
Thick, sturdy, hard almost like cardboard
Size: Extra Large (Pack of 1)
These are sturdy and thick. They held a steak and baked potato tonight just fine - did this to try sturdiness and leak. It is one of the best paper plates I've found, so I highly recommend. I got the blue pattern and they're beautiful. By the way, these are big paper plates, not the little thin ones-- sturdy.
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Reviewed in the United States on March 20, 2026

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