
Natural clinoptilolite, direct from the deposit
A rock that holds what you paid for.
Water, ammonium and the nitrogen in your fertiliser all move faster through soil, sand and water than you would like. Clinoptilolite holds them where they are useful — by ion exchange, not by chemistry you have to reapply. It does not decompose and it does not wash out.
We mine, mill and ship one mineral from one deposit in South East Asia, and sell it straight to the customer. No trading house, no repackager, no one in the middle taking a margin for moving a pallet from one warehouse to another.
That is the whole reason we can quote what we quote — and the reason we can tell you the assay of the batch you are actually buying.
Why buy from us
One deposit, one owner, one assay
Every consignment comes from the same pit and ships with a batch certificate — clinoptilolite content by XRD, cation exchange capacity, moisture and heavy metals.
A vertical chain, and the price that follows
From the ground to your yard without a middleman. We would rather share the margin with the customer than with a distributor.
We publish what it does not do
Clinoptilolite is a cation exchanger. It holds ammonium. It does not hold nitrate and it does not hold phosphate, whatever a competing listing says. You will find that sentence on every page of this site.
Trials before invoices
For most applications we will part-fund a trial on your own site, with a written protocol, and publish the result whichever way it goes.
Seven things it is bought for
Each one has its own grade, its own dose and its own evidence. Pick the one you recognise.
Water treatment and aquaculture
Ammonia is the thing that kills fish. This takes it out.
Read more →
Agriculture
You buy the nitrogen. Keep it.
Read more →
Turf and sports surfaces
More water where the roots are. Same drainage.
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Garden and landscaping
Your soil forgets. This remembers.
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Animal bedding and feed
Drier beds. Less ammonia in the air. And the nitrogen goes to the field.
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Spill absorbent and industrial surfaces
Inert, non-flammable, and it does not become plastic waste.
Read more →
Warm-mix asphalt and winter grit
Lay it 25 degrees cooler.
Read more →How it works, in three minutes
Gratierne · zeolite.gratierne.com · Natural clinoptilolite from mineral sources in South East Asia, direct from the deposit.
Specification
- Clinoptilolite content
- 93–100% (XRD)
- Cation exchange capacity
- 108–146 meq/100 g
- Bulk density
- 650–850 kg/m³
- pH
- 7.0–8.0
- Specific surface area
- 40 m²/g
- Pore diameter
- 0.43 nm
- Hardness (Mohs)
- 2–3
- Loss on ignition
- 6.4–15.8%
- Na₂O
- 0.3–1.3%
- Quartz
- 0–2%