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Description
Pseudo-stromatolite, extra largeLocale: Morocco Approx dimensions: 7 x 6. 25 x 4" Approx weight: 9 lbs 12. 5 oz A stromatolite is a sedimentary fossil structure made by prehistoric bacteria colonies, typically cyanobacteria. Stromatolites in fact are still living and forming in some parts of our world today, including Australia, and are among the earliest forms of lifeand fossilson our Earth. The fossils form in shallow water conditions of lakes or salt water shores. First,
Locale: Morocco
Approx dimensions: 7 x 6.25 x 4"
Approx weight: 9 lbs 12.5 oz
A stromatolite is a sedimentary fossil structure made by prehistoric bacteria colonies, typically cyanobacteria. Stromatolites in fact are still living and forming in some parts of our world today, including Australia, and are among the earliest forms of life—and fossils—on our Earth.
The fossils form in shallow water conditions of lakes or salt water shores. First, cyanobacteria grow in microbial mats. Minerals like calcium carbonate precipitate (crystalize from the water) onto the surface of the mat. The bacteria acts as a glue, cementing it all together with sedimentary debris. Layers build up over time like a bacterial pearl; the name “stromatolite” appropriately means “layered rock” in Greek.
This, however, is not a stromatolite. They are commonly believed to be stromatolites, and you will more often than not see them sold under that name and description. More accurately, they are concretions formed out of beautiful tones of red sandstone material. These sandstone concretions form in a manner similar to stromatolites, but minus the aid of bacteria: mineral-rich waters precipitate barite which binds with sand to form concentric layers around a nucleus. It is a relative of the barite desert rose, which grows clusters of round blade-like ‘petals.’
This specimen makes for an inexpensive large piece to add to your mineral collection or use as decor around the home. While pseudo-stromatolites typically have a rounded or conical back, this specimen is wide and flat like a lopsided cake with round nubbins attached to the side.
UV reactivity Many pseudo-stromatolites from Morocco have faint to moderate white fluorescence and light yellow-green phosphorescence under 365 nm UV light. This specimen has good reaction, with phosphorescence apparent.
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4.7 ★★★★★
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Product Reviews
★★★★★ 4
Worked fine for me
Size: 10 Pairs
I saw some reviews that mention difficulty in threading or fitting. They are tight, but they work fine. I had no issues installing the speaker wire and no issues with the set/crimping screws. I even had one fall out when I loosened it too much and, though it was challenging without my glasses, I did get it to thread back in with no problems. I have purchased other BluRigger products, like HDMI cables, and they are of great quality.
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Reviewed in the United States on December 19, 2024
★★★★★ 5
They look great and work great!
Size: 12 Pairs
Great contact screws with bare wires and solid inserting with the banana clips! Would buy again!
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Reviewed in the United States on March 25, 2026
★★★★★ 5
Easy
Size: 12 Pairs
Easy to use.
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Reviewed in the United States on April 30, 2026
★★★★★ 3
Not sure how it works
Size: 6 Pairs
Appears to tight a space for two wires to travel through and be connected
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Reviewed in the United States on April 27, 2025
★★★★★ 5
Good quality
Size: 2 Pairs
These are nice connectors that I bought for some electronic box to record my vinyl and cassette collection onto my new desktop computer. I needed a second set of wires to go to a pair of JBL l100s so that I can hear what I'm recording I guess. This box I'm speaking of was recommended by Google Gemini and I can't get it to update so don't know what to do now. Also because of Gemini, I ordered HDMI cables to replace my 10-year-old ones and bought this brand and forgot to use the 10% discount that they offered. The HDMI cables are really great too
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Reviewed in the United States on October 16, 2025