manganese-oxide

5 things you didn’t know about…paint

‘The walls at Dendera, on the west bank of the Nile in central Egypt are still brightly coloured despite 2,000 years of exposure to the elements.’

A painted relief of the sacred eye of Horus at the ancient Egyptian temple of the goddess Hathor at Dendera, in Egypt.

1. The earliest known use of paint dates back around 40,000 years to the cave paintings of southern Europe. The naturally occurring pigments used include ochre, haematite, manganese oxide and charcoal.

2. Ochre was commonly used as a pigment, and its name is still used today to describe the colour. Derived from naturally tinted clay, ochre is hydrated iron oxide, or in geological terms – limonite.

3. Oil paints were developed outside Europe, possibly in Afghanistan, approximately 2,800 years ago, using walnut or poppy seed oil as the binder. Since the Renaissance, these have been popular paints for fine art.

4. In the 1940s, acrylic paints were first produced by suspending pigment in an acrylic polymer emulsion. Once applied, they are water resistant. Acrylic paints dry very quickly, although glycol or glycerin can be added as acrylic retarders to allow time for blending and highlighting.

5. Ultramarine (a deep blue) can be made using pure clay with silica and alumina in the ratio SiO2:Al2O3 (kaolin), anhydrous sodium sulphate Na2SO4, anhydrous sodium carbonate Na2CO3, powdered sulphur and powdered charcoal. But, ground lapis lazuli is considered by many the most brilliant hue.

For more on the history of paint, read Maria Felice’s Material of the Month piece here

hey just a little psa to everyone who has eczema like me (also psoriasis and some other chronic skin conditions) and who wants to get a tattoo

please be very careful because the metals used to create tattoo ink (like iron oxide, aluminum, manganese) can cause serious allergic reactions to people with eczema. we’re actually more likely to have allergic reactions because our skin is so sensitive

this doesn’t mean that you can never have a tattoo, but please research it fully before you make a decision; some places will give you a patch test to see if you react badly to the ink

here are some links i found helpful when looking into this for myself:

👑 Black Beauty with a Crown of Silver 🌌… Silver Crown Psilomelane has a striking and super rich appearance! Psilomelane refers to a group of manganese oxide minerals, and silver crown is a variety of psilomelane in cryptocrystalline quartz. The botryoidal habit seen in this specimen is a classic growth pattern for psilomelane; the delicate banding is a cool contrast to the jet black material. This piece has a unique freeform shape and matte to submetallic luster. Snap it up now for a great price! 👑 Locality: Chihuahua, Mexico. 2.00" x 1.50" x 1.13", 46.8 g (1.65 oz)–just $13 on PhenomenalGems.Etsy.com. #psilomelane #black #manganese #oxide #botryoidal #bands #gemstone #mineral #quartz #silvercrown #crownofsilver #geology #newmoon #specimen #raw #collector #healing #display #jewelryartisan #phenomenalgems #etsy

5

This is number five in a series of five Washington DC Row Houses. LOVED how this warm green turned out. The manganese oxide is doing a sweet number on the windows, too. =}

Strong magnetic separator processing equipment

Separator With the new mineral species found in more and more attention. Magnetic Separators elected beneficiation of two or more separate products. Different magnetic mineral particles along a different trajectory. processing equipment: the new dry high intensity magnetic separator limonite, magnetic separator can be a lot like sorting minerals: magnetite. Hematite Quarry Crusher, manganese siderite, ilmenite, wolframite, manganese carbonate, manganese ore, metallurgical manganese ore, manganese oxide, iron sands, kaolin, rare earth mine and so can be used to sorting separator. magnetic and mechanical force on mineral particles and to achieve separation of the main department of magnetic separator is a mountain-shaped electromagnet and the rotatable disc composed induction suspended aid. Classifier which 576 mm double disc used more often. Magnetic field strength up to 880-1440 kA / m. A single disc (diameter = 900 mm) Double (= 576 mm) and three (= 600 mm) three. To prevent clogging, magnetic separation process is magnetic separator machine. Ore cylinder built with a weak magnetic field, can be pre-discharge to feed the strong magnetic minerals. mainstream magnetic separator beneficiation equipment. Dry magnetic separator equipment is commonly used in iron and manganese equipment divided into:. a three-roll tube dry high intensity magnetic separatorVertical Roller Mill, two-cylinder two-roll dry magnetic separator, a tube of a roll of the dry magnetic separator ; dry high intensity magnetic disc magnetic separator is widely used in separation of less than 23 mm of weakly magnetic minerals and rare metal ores selection again. diameter than the width of the belt to mine about one minute sophomore disc like a turned upside down with the tines of dishes. Mixing drum disk using worm gear reducer by hand wheel adjustable pole distance (adjustment range of 020 mm between the disc and the electromagnet. will provide a full range of magnetic separation equipment, customer satisfaction, rest assured.

🌌 💣 Black Magic: Silver Crown Psilomelane has a striking and super rich appearance! Psilomelane refers to a group of manganese oxide minerals, and silver crown is a variety of psilomelane in cryptocrystalline quartz. The botryoidal habit seen in this specimen is a classic growth pattern for psilomelane; the delicate banding is a cool contrast to the jet black material. This piece has a unique nodular shape and matte to submetallic luster. Snap it up now for a great price! 💣 Locality: Chihuahua, Mexico. 1.50" x 1.13" x 0.88", 31.1 g (1.1 oz)–just $9 on PhenomenalGems.Etsy.com. #psilomelane #black #manganese #oxide #botryoidal #bands #gemstone #mineral #quartz #silvercrown #crownofsilver #geology #newmoon #specimen #raw #collector #healing #display #jewelryartisan #phenomenalgems #etsy