VanSil CS-1 Wollastonite — Natural Calcium Silicate for Plants
VanSil CS-1 is a fine-particle wollastonite mineral mined and milled in New York State — the only OMRI-certified wollastonite sourced and processed entirely in the USA. It is not a slag byproduct.
Use it as a premium alternative to lime to deliver plant-available silicon (Si) and carbon-neutral calcium (Ca) directly to your root zone. Ideal for soilless potting mixes, coco coir, and organic production systems.
Key Benefits
- Boosts plant cell wall strength and stress tolerance via bioavailable silicon
- Raises media pH gently without the spike risk of hydrated lime
- Carbon-neutral calcium source — no heavy metals, no slag
- OMRI Listed for use in certified organic production
- Fine CS-1 particle size for effective nutrient release
Guaranteed Analysis
- CaO: 45% | Ca: 34%
- SiO2: 50% | Total Si: 24% | Soluble Si: 3.6%
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Technical Data Sheet
- SDS
- OMRI certificate
- Bio-available silicon release rates
About VanSil / Vanderbilt Minerals
Vanderbilt Minerals has operated the only US wollastonite mine in Lewis County, New York for decades. VANSIL grades are trusted by professional growers, specialty crop cultivators, and organic farmers worldwide.
- OMRI Listed: The only OMRI certified wollastonite mined and milled in the United States.
- Easy to use: Use as an alternative to lime and to provide Plant Available Silicon and Calcium in your soilless potting mixes.
- High Analysis: Wollastonite has 34% calcium and 21% silicon.
- Pure: Low in heavy metals, sodium and chloride.
Typical Chemical Analysis (calculated as oxides)
| Calcium Oxide (CaO) 45% | Calcium (Ca) 34% |
| Silicon Dioxide (SiO2) 50% | Total Silicon (Si) 24% Soluble Silicon(AAPFCO 5 day method) 3.6% |
| Aluminum Oxide (Al2O3) 0.7% | Magnesium Oxide (MgO) 1.5% |
| Iron Oxide (Fe2O3) 0.2% | Sodium Oxide (Na2O) <0.1% |
| Manganese Oxide (MnO) <0.1% | pH of a 10% slurry 10-11 |
VanSil CS-1 Wollastonite Calcium Silicate 50 lb
VanSil CS-1 Wollastonite Calcium Silicate 50 lb
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