Raw, calcined and burnt grades
Powder and chips alongside calcined and dead-burnt dolomite, so steel, ceramic, coating and construction buyers can qualify one supplier for several needs.
Industrial Mineral
Dolomite — Manufacturer & Exporter from India
Dolomite powder, chips, calcined and dead-burnt grades from Gujarat, Rajasthan and Madhya Pradesh, controlled for chemistry and size for steel, ceramics, coatings and construction.
PowderGranulesChipsCalcined
ISO 9001 certified processes
NABL-accredited lab testing
CoA, TDS & MSDS with every shipment
Export packaging worldwide
Overview
What is Dolomite?
Dolomite is a calcium magnesium carbonate, CaMg(CO₃)₂, formed when magnesium-rich waters alter limestone deposits over geological time. Pure dolomite contains about 30.4 % CaO and 21.9 % MgO, with the balance released as carbon dioxide on heating. That pairing of lime and magnesia, together with low silica and iron in selected deposits, is what makes dolomite useful well beyond a simple filler.
In its raw form, dolomite is ground to a controlled fineness for paints, ceramic bodies and glazes, or crushed and screened into chips for terrazzo and decorative aggregate. Heat changes its character. Calcination at roughly 900–1,100 °C drives off CO₂ and leaves reactive calcined dolomite, also called doloma, which steel plants use as a magnesia-bearing flux. Firing at far higher temperatures, typically 1,600 °C and above, sinters the material into dense, low-porosity burnt dolomite for refractory and metallurgical duty.
Performance depends on consistency, and the property that matters changes with the application. In a coating it is whiteness and particle size distribution. In a basic oxygen or electric arc furnace it is MgO level and reactivity. In a refractory mix it is bulk density and resistance to hydration. Each Obsidian Minerals grade is produced to a defined chemistry and size range rather than sold as a generic commodity.
Obsidian Minerals processes dolomite at sites in Gujarat, Rajasthan and Madhya Pradesh under ISO 9001 certified processes, with testing at an NABL-accredited laboratory. Every shipment carries a Technical Data Sheet, MSDS/SDS and a batch Certificate of Analysis. Material is packed in 25 kg or 50 kg bags or in 1 MT and 1.2 MT jumbo bags, and samples or custom sizes can be arranged on request.
Dolomite grades
Select a grade for its typical properties, applications, usage guidance and FAQs.
Dolomite
Calcined Dolomite
Reactive light-burnt dolomite that supplies MgO to steelmaking slag, protecting magnesia-carbon linings and supporting slag control.
Refractory & Steel DolomiteDolomite Powder
Finely ground white dolomite with controlled residue and low iron, used as a functional filler and as a CaO–MgO source for ceramics.
Paints & Ceramics DolomiteDolomite Chips
Crushed, screened and graded white dolomite chips for terrazzo flooring, decorative finishes and landscaping.
Construction DolomiteBurnt Dolomite
Dense, low-porosity dolomite clinker fired at sintering temperature for refractory linings, gunning masses and furnace fettling.
Metallurgy| Grade | Specification | Primary use | Link |
|---|---|---|---|
| Calcined Dolomite | On TDS | Refractory & Steel | Specs |
| Dolomite Powder (200 / 325 Mesh) | 200/325 mesh | Paints & Ceramics | Specs |
| Dolomite Chips (3–10 mm) | 3–10mm | Construction | Specs |
| Burnt Dolomite (Dead-Burnt / Sintered) | On TDS | Metallurgy | Specs |
From deposit to dispatch
- 01
Selective quarrying and sorting
- 02
Crushing and screening
- 03
Grinding and air classification
- 04
Calcination or high-temperature sintering
- 05
QC testing and packing
Why source Dolomite from Obsidian Minerals
Three-state raw material base
Manufacturing in Gujarat, Rajasthan and Madhya Pradesh supports continuity of supply and selection of deposits suited to each grade's chemistry.
Documented quality
ISO 9001 certified processes, NABL-accredited laboratory testing, and a batch CoA, TDS and MSDS/SDS with every dolomite shipment.
Dolomite — frequently asked questions
What is dolomite used for?
Dolomite is used as a filler and extender in paints, putties and polymers, as a source of lime and magnesia in ceramic bodies and glazes, and as a decorative aggregate in terrazzo and landscaping. Heat-treated forms serve heavy industry: calcined dolomite is a flux and slag conditioner in steelmaking, while burnt dolomite is a refractory grain for furnace and ladle linings.
What is the difference between dolomite and limestone?
Limestone is mainly calcium carbonate, CaCO₃, while dolomite is a double carbonate of calcium and magnesium. Pure dolomite contains about 21.9 % MgO, which limestone largely lacks. Dolomite is also slightly harder and denser. The magnesia content is the main reason buyers choose dolomite, for example to supply MgO to steelmaking slag or to ceramic bodies.
What is the difference between calcined dolomite and burnt dolomite?
Both start as dolomite and are heated, but to very different temperatures. Calcined dolomite is light-burnt at roughly 900–1,100 °C; it stays porous and reactive, so it dissolves quickly in slag and is used as a flux. Burnt dolomite, also called dead-burnt or sintered dolomite, is fired at around 1,600 °C or more until it becomes dense and much less reactive, which suits refractory use.
Which dolomite grades does Obsidian Minerals supply?
Four grades are offered: calcined dolomite for steelmaking, dolomite powder in 200 and 325 mesh for paints and ceramics, dolomite chips in 3–10 mm sizes for construction, and burnt dolomite for metallurgical and refractory applications. Other particle sizes and chemistry limits can be developed with customers on request.
How is dolomite packed for export?
Powder and fines are packed in 25 kg or 50 kg HDPE or paper bags. Chips, lump and grain grades are usually shipped in 1 MT or 1.2 MT jumbo (FIBC) bags. Calcined and burnt grades are packed with liners to limit moisture pick-up. Custom and private-label packaging is available on request, and each shipment includes a TDS, MSDS/SDS and batch CoA.
Can I get a dolomite sample before ordering?
Yes. Samples of each dolomite grade are available on request for laboratory evaluation or plant trials. Share your application, target chemistry and particle size, and the sample will be sent with its technical data so you can compare it directly against your current material or specification.
What packaging options are available for Dolomite?
Standard export packing is 25 kg or 50 kg HDPE / paper bags and 1 MT or 1.2 MT jumbo (FIBC) bags, palletised and shrink-wrapped on request. Custom and private-label packaging can be arranged for volume orders.
Do you provide MSDS and technical datasheets?
Yes. A Technical Data Sheet and MSDS are available for every grade, and each shipment is accompanied by a batch-specific Certificate of Analysis.
Request a quote
Interested in Dolomite?
Tell us your application, preferred grade and volume. Our engineering team will recommend the right grade and send a datasheet, sample and quotation.
- Technical Data Sheet & MSDS
- Samples for qualification trials
- Bulk and recurring supply pricing