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Description
Pyrolusite Specimen #92Pyrolusite Specimen #92 Pyrolusite is a mineral consisting essentially of manganese dioxide (MnO2) and is important as an ore of manganese. It is a black, amorphous appearing mineral, often with a granular, fibrous, or columnar structure, sometimes forming reniform crusts. It has a metallic luster, a black or bluish black streak, and readily soils the fingers. The specific gravity is about 4. 8. Its name is from the Greek for fire and to wash, in
- Pyrolusite Specimen #92
- Pyrolusite is a mineral consisting essentially of manganese dioxide (MnO2) and is important as an ore of manganese. It is a black, amorphous appearing mineral, often with a granular, fibrous, or columnar structure, sometimes forming reniform crusts. It has a metallic luster, a black or bluish-black streak, and readily soils the fingers. The specific gravity is about 4.8. Its name is from the Greek for fire and to wash, in reference to its use as a way to remove tints from glass.
- Natural Pyrolusite has been used in batteries, but high-quality batteries require synthetic products. Pyrolusite is also used to prepare disinfectants (permanganates) and for decolorizing glass. When mixed with molten glass it oxidizes the ferrous iron to ferric iron, and so discharges the green and brown tints (making it classically useful to glassmakers as a decolorizer). As a coloring material, it is used in calico printing and dyeing; for imparting violet, amber, and black colors to glass, pottery, and bricks; and in the manufacture of green and violet paints.
- Measures approx. 3" x 3" x 2 1/2"
- Some of the most famous early cave paintings in Europe were executed by means of manganese dioxide. Blocks of pyrolusite are found often at Neanderthal sites. It may have been kept as a pigment for cave paintings, but it has also been suggested that it was powdered and mixed with tinder fungus for lighting fires.[9] Manganese dioxide, in the form of umber, was one of the earliest natural substances used by human ancestors. It was used as a pigment at least from the middle paleolithic. It may have been also used by the Neanderthals in fire-making.[10]
- Origin the San Antonio Mine, Santa Eulalia Mining District, Chihuahua, Mexico
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4.9 ★★★★★
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Product Reviews
★★★★★ 5
Quality No Show Socks That Are Comfortable and Durable
Size: Large, Color: (100) White / White / Black
These Under Armour no show socks are great for everyday training and casual wear. The cotton blend feels comfortable and they stay in place throughout the day. Getting six pairs in a pack is solid value for a quality brand. They hold up well after multiple washes and the no show style works great with most athletic shoes. A reliable go-to sock.
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Reviewed in the United States on April 30, 2026
★★★★★ 5
Comfortable
Size: Large, Color: (001) Black / Black / White
I recently picked up a pair of Under Armour socks, and they’ve quickly become my go-to choice for daily wear and workouts. From the first wear, the fit felt snug and supportive without being too tight. The fabric is lightweight yet durable, and it does a great job wicking sweat — keeping my feet dry even during longer runs or intense gym sessions.
One of the things I appreciate most is the arch support and cushioning in the right places. It adds just enough padding where I need it, especially under the ball and heel of the foot, which makes a noticeable difference on days when I’m on my feet a lot. The socks also have a nice breathable mesh pattern that improves airflow.
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Reviewed in the United States on January 4, 2026
★★★★★ 5
Works as expected for it's intended purpose.
Color: Black, Size: Upgraded Base-1 Panel
This room divider was easy to put together and is sturdy enough so it wont tip over if it's bumped.
Included instructions weren't very clear and some parts weren't labeled, but once you figure out how to put it together
it works as expected. The material is a bit wrinkled so if that is a concern you can iron it prior to installation. The size is fine for a smaller room and the thickness of the material is fine for it's intended use.
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Reviewed in the United States on February 25, 2026
★★★★★ 5
Hogar
Color: Black, Size: Upgraded Base-1 Panel
Cómodo para dividir espacio en tu hogar . Recomendable
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Good
Color: Black, Size: Upgraded Base-1 Panel
It’s goood
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Reviewed in the United States on May 26, 2026