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Dolomite CaMg(CO₃)₂

CaMg(CO3)2

The dual carbonate mineral — unique calcium-magnesium chemistry for glass, ceramics, steel, agriculture, and construction applications.

95%+ Purity
90%+ Whiteness
Natural
ISO Certified
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12+Grades
10+Industries
35+Countries
30+Years
Dolomite - 20 Microns
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Product Overview

About Dolomite

Understanding the fundamentals of dolomite

Product Overview

The Dual Carbonate Mineral

Dolomite (CaMg(CO₃)₂) is a calcium magnesium carbonate with unique double carbonate structure, harder than limestone with excellent chemical and thermal properties.

Its dual calcium-magnesium chemistry provides unique benefits in glass making, steelmaking, refractory applications, and as a magnesium source in agriculture and animal feed.

Sedimentary Crystalline Dolomitic Limestone
CaMg(CO3)2

Chemical Formula

Dolomite

Chemical Properties
  • CaMg(CO3)295-98%
  • CaO Content28-32%
  • MgO Content18-22%
  • pH Value9.0 – 10.0
Physical Properties
  • Mohs Hardness3.5-4
  • Whiteness88 – 95%
  • Specific Gravity2.85
  • LOI45-47%
95%+
Purity
90%+
Whiteness
3.5-4
Mohs Hardness
ISO
Certified

Natural Mineral

Naturally occurring, eco-friendly mineral source.

NaturalSustainableEco-Friendly
Dolomite mineral deposits
Natural Source

From Dolomite Mountains
to Industrial Applications

Sourced from premium deposits and processed for consistent quality across diverse applications.

1 Billion+Tons Global Reserve
30+Years Processing
6+Mining Sites
Dual carbonate
Higher hardness
Mg source
Consistent quality
Multi-purpose
Advantages

Key Benefits

Why dolomite is the preferred choice for industry leaders worldwide

01

Dual Carbonate Chemistry

Unique calcium-magnesium composition provides specialized benefits in glass and steel.

02

Higher Hardness

Mohs 3.5-4 hardness provides better scrub resistance than limestone (CaCO₃).

03

Refractory Properties

Excellent for refractory applications due to MgO content after calcination.

CaMg(CO₃)₂
95%+Purity
6Key Benefits
10+Industries
04

Magnesium Source

Natural source of magnesium for agriculture, animal feed, and soil amendment.

05

Good Whiteness

High whiteness grades available for paints, plastics, and construction chemicals.

06

Cost Effective

Economical mineral for flux, filler, and neutralization applications.

Industrial manufacturing excellence
World Class Quality

Industry-Leading Performance
at Every Scale

Trusted by leading manufacturers across 50+ countries for consistent, high-purity dolomite that meets international standards.

ISO 9001 EcoVadis Gold REACH Compliant Lab Certified
ISO Certified
Global Supply
Lab Tested
Industry Leading
Product Range

Available Grades

Comprehensive range of dolomite grades for diverse industrial applications

Precision quality testing of dolomite grades

Precision Engineered Grades

Every grade is meticulously tested in our state-of-the-art laboratories to meet the most demanding industrial specifications worldwide.

Purity95%+
Whiteness90%+
Mohs Hardness3.5-4
CertifiedISO
Most Popular
Glass

Glass Grade Dolomite

Low Iron

Low iron dolomite for clear glass production providing magnesium flux.

  • Low Fe2O3
  • High purity
  • Consistent sizing
Learn More
Steel

Steel & Refractory Grade

High MgO

High-MgO dolomite for steelmaking flux and refractory applications.

  • High MgO
  • Calcination grade
  • Sintering quality
Learn More
Filler

Filler Grade Dolomite

High Whiteness

Micronized dolomite for paints, plastics, and construction applications.

  • 90%+ whiteness
  • Fine particles
  • Good coverage
Learn More
Agriculture

Agricultural Grade

Soil Amendment

Dolomitic limestone for soil pH correction and magnesium supplementation.

  • Mg source
  • pH neutral
  • Slow release
Learn More
Product Statistics
4Grade Categories
12+Product Variants
VariousMesh Sizes
Request Custom Grade
ISO 9001 Certified Global Delivery Technical Support Custom Solutions
Applications

Industries & Applications

Versatile applications across diverse industry verticals worldwide

Glass Industry

Glass Industry

Flux in glass batch providing magnesium oxide for improved glass properties.

ContainerFlat GlassSpecialty
12%Batch Addition
Steel & Iron

Steel & Iron

Flux in steelmaking for slag formation and refractory repair.

SteelmakingFluxRefractory
EssentialFlux
Paints & Coatings

Paints & Coatings

Filler and extender in decorative and industrial paints.

DecorativeIndustrialPrimers
90%Whiteness
Construction

Construction

Aggregate, concrete additive, and construction chemical ingredient.

ConcreteAggregateChemicals
DurabilityBoost
Agriculture

Agriculture

Soil amendment and magnesium source for crops and livestock.

SoilFeedFertilizer
NaturalMg Source
Ceramics

Ceramics

Flux and body component in ceramic and tile production.

TilesSanitarywareBodies
FluxFunction
10+Industries
12+Applications
35+Countries
500+Customers

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Our experts help you find the perfect grade

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Our Promise

Why Choose 20 Microns?

World-class quality minerals backed by decades of expertise & innovation

20 Microns state-of-the-art manufacturing facility

Years of
Excellence

ISO 9001
Dual Carbonate
Premium
Certified

Our dolomite is sourced from premium deposits and processed to deliver consistent purity, whiteness, and particle size for demanding applications.

Premium Quality

Finest dolomite deposits

Advanced Processing

State-of-the-art facilities

Consistent Quality

Batch-to-batch reliability

Technical Support

Expert application assistance

Start Your Journey With Us
Key Metrics
6+Processing Plants
35+Countries Served
500+Happy Customers
30+Years Experience
EcoVadis Gold Sustainability Rating
95%+Purity
R&DInnovation
24/7Logistics
ExpertSupport
Knowledge Base

Frequently Asked Questions

Get answers to common questions about Dolomite

Knowledge Center

Find detailed answers about specifications, applications, and technical details.

4Questions
24/7Support
TechnicalApplicationsGradesQuality

Still Have Questions?

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01

What is dolomite used for?

Dolomite is used in glass making, steel production, refractory applications, paints, construction, and agriculture for its unique calcium-magnesium chemistry.

Glass Steel Agriculture
02

How is dolomite different from limestone?

Dolomite contains magnesium carbonate (MgCO₃) in addition to calcium carbonate. It is harder (Mohs 3.5-4 vs 3) and provides MgO in glass and refractory applications.

Contains Mg Harder Dual Carbonate
03

Why use dolomite in glass making?

Dolomite provides magnesium oxide (MgO) to the glass batch, improving chemical durability, reducing melting temperature, and enhancing glass stability.

MgO Source Flux Durability
04

What grades are available?

We offer glass grade, steel/refractory grade, filler grade, and agricultural grade dolomite with various particle sizes to suit specific applications.

Glass Grade Filler Grade Agri Grade

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Our technical experts are available to provide detailed answers

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Industry Applications

Product Applications

Dolomite serves as a critical input across diverse industrial sectors worldwide

01

Glass Making

Flux providing magnesium oxide.

02

Steel Production

Slag forming flux.

03

Refractories

High-MgO applications.

04

Paints

Filler and extender.

05

Construction

Aggregate and additive.

06

Agriculture

Soil amendment.

07

Ceramics

Body flux.

08

Plastics

Filler in compounds.

8+Application Sectors
12+Product Grades
35+Countries Served
500+Industry Clients
Dolomite industrial applications worldwide
Global Industrial Reach

Powering Industries Across
50+ Countries

From cosmetics to oil & gas — dolomite is the essential mineral behind thousands of products you use every day.

Need a Specific Grade for Your Application?

Our experts will guide you to the perfect dolomite solution

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Product Video

See It In Action

Watch how 20 Microns' Dolomite powers real-world industrial applications

Dolomite in Action – 20 Microns
YouTube
Official Product Film

Dolomite - The Dual Carbonate Mineral

20 Microns Limited · Official Channel

About This Video

Discover how 20 Microns' Dolomite grades deliver superior performance across industrial applications.

  • Product manufacturing overview
  • Quality control processes
  • Application demonstrations
  • Global supply capabilities
Watch on YouTube

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