Sheffield Pottery

Manganese Carbonate

$42.20

Unit price: per

SKU : RMMANCAR

Item Class Raw Materials

Availability

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Product Description

For browns, plum purples and metallic bronze effects in glazes, and for darker clay bodies.

You must test before you use it, at any scale. Raw materials, mined or man-made, are not consistent. Color, strength, particle size and chemistry can change from one bag to the next and from one supplier to another, even when the name on the bag stays the same. Before you use this material in a glaze, slip or clay body of any size, mix a small test batch, fire it on your own clay in your own kiln, and check the results.

What it is

A pale pink powder. Manganese gives browns and plum purples in glazes, and at high amounts metallic bronze or black surfaces. It also darkens and speckles clay bodies. The carbonate is the fine-grained form, so it mixes in more evenly than manganese dioxide.

Getting started

Start at 2 to 4% (2 to 4 grams per 100 grams of dry glaze). Most glazes use 6% or less.
Glazes high in sodium or potassium push it toward purple; most others give browns.
Metallic glazes use much more manganese and need extra care. Read the safety notes first.
Always fire with kiln ventilation.

For glaze formulators

Manganese carbonate, MnCO₃. Loses about 38% of its weight as gas in firing.
1 part MnO₂ ≈ 1.3 parts MnCO₃ for the same manganese.
Finer than manganese dioxide, so fewer specks. The gas it gives off can cause blistering at higher amounts.
With iron: browns. With iron and cobalt: blacks.

Safety

Manganese gives off fumes during firing. Repeated breathing of manganese fumes or dust can damage the nervous system. Vent your kiln to the outside and stay out of the kiln room while it fires.
Wear a NIOSH-approved respirator (N95 or better) and gloves when handling it dry. Clean up with a wet sponge, not a broom.
Avoid high-manganese glazes on food surfaces, and have functional ware lab-tested before you sell it.

Sizes & pricing

Size	Price	Per lb
1 lb	$42.20	$42.20	Add to cart
5 lb	$194.75	$38.95	Add to cart
10 lb	$373.50	$37.35	Add to cart
25 lb	$892.50	$35.70	Add to cart
55 lb bag	$1,784.50	$32.45	Add to cart

Full bags mix and match. Every full bag in your order, of any raw material, adds up. That total sets the price of every bag. Smaller sizes don't count.

This bag's price stays the same at every level, but it still counts toward your full-bag total.

Prices from our October 23, 2026 price list.

Frequently Asked Questions

Glaze and clay recipes go by weight, not by volume, and they don't count water. Each ingredient is a share of the dry total. 2% means 2 grams for every 100 grams of dry ingredients. For a 500-gram batch, that's 10 grams. Colors and opacifiers are often listed as extras on top of a recipe that adds up to 100, written like "+2" or "add 2%." Weigh those the same way: 2 grams for every 100 grams of the base recipe. A digital scale that reads to 0.1 gram makes small amounts easy.

A test tile is a small piece of the clay you use, glazed and fired just like your real work. Raw materials vary from bag to bag, and results also change with your clay, how thick you apply the glaze and how your kiln fires. A test tile is the only way to know what you'll get before you glaze a whole batch of pots. Write what's on each tile on the back (an underglaze pencil works), and keep notes so you can repeat what works.

Yes, whenever you handle the dry powder. Fine dust is the main hazard with most raw materials, and some can harm your lungs over time. Wear a NIOSH-approved respirator (N95 or better) while you weigh and mix. A basic dust mask that isn't N95-rated won't protect you. Once a material is mixed with water, dust is much less of a problem, but wipe up spills with a wet sponge before they dry, and mop instead of sweeping. Don't eat or drink while you work, and wash your hands afterward. Check each product's Safety section for anything extra that material needs.

Manganese Carbonate

1 Pound