rockflour.co supplies Greenlandic Rock Flour (GRF), a naturally pre-ground silicate rock powder that fertilizes cropland while permanently capturing CO2 through enhanced weathering. The ultra-fine particles, averaging 3/1000 millimeters, rapidly release potassium, phosphorus, and micronutrients in warm, wet, slightly acidic soils, with trials demonstrating yield increases up to 30%.
Funding
Funding not disclosed
Founders
Product
Problem
Conventional agricultural fertilizers rely on energy-intensive extraction and synthesis processes that generate significant greenhouse gas emissions. Meanwhile, scalable carbon dioxide removal solutions are urgently needed to offset emissions from hard-to-decarbonize sectors like agriculture, as many existing nature-based approaches offer only temporary carbon storage and compete with food production for land.
Solution
rockflour.co provides Greenlandic Rock Flour (GRF), a 100% natural, non-toxic, ultra-fine rock powder that acts as a plant nutrient source while simultaneously capturing atmospheric CO2. Derived from glacial meltwater deposits created by the Greenland ice sheet grinding bedrock, the micron-sized particles rapidly weather when applied to croplands in warmer climates, releasing essential minerals like Potassium (K), Phosphorus (P), and other key micronutrients. This weathering process also binds CO2 into stable bicarbonates that remain locked away for over 100,000 years. With each ton of GRF capturing up to 25% of its weight in CO2, the product delivers both soil fertilization and permanent carbon sequestration, offering a climate-negative input for crop agriculture.
Target Audience
Primary customers include conventional and regenerative crop farmers, agricultural cooperatives, and ag-tech companies seeking both yield improvements and verifiable carbon removal credits from their operations.
Features
- Naturally pre-ground to an average grain size of 3/1000 millimeters, providing a large surface area that accelerates weathering without additional energy-intensive milling
- Rapidly captures up to 25% of its weight in CO2 through enhanced weathering, converting it into stable bicarbonates for permanent storage
- Supplies essential plant nutrients including Potassium (K), Phosphorus (P), and other micronutrients as the rock particles break down in soil
- Supports soil pH regulation and improves soil structure as co-benefits beyond nutrient delivery
- Field trials in Ghana and Denmark funded by the Novo Nordisk Foundation demonstrated crop yield increases of up to 30% over multiple growing seasons
- Optimized performance in warm, wet climates with slightly acidic soils, where carbon capture and nutrient release are most efficient