Greenstone comes from Te Waipounamu, the South Island of New Zealand. ✨ Most of it is found on the West Coast, Te Tai o Poutini, in and around rivers such as the Arahura and Taramakau. It forms deep underground, where two very different rocks fuse under great heat and pressure. The rising Southern Alps lift it up, and ice and rivers carry it down to the beaches.
That is the geology. In Māori tradition, the story starts with a taniwha called Poutini and a woman called Waitaiki. You will meet both below, along with what raw stone looks like and what you are allowed to pick up.
Where is greenstone found in New Zealand? 🌊
Pounamu, the Māori name for New Zealand greenstone, is a South Island stone. The island's name, Te Waipounamu, means the greenstone waters. The West Coast is its heartland. Carvers say most nephrite is found between the Taramakau River in the north and the Hokitika River in the south, up into the foothills of the Southern Alps. Rarer types come from further south, as far as Milford Sound.
You usually find it in or near rivers, not up in the mountains where it formed. Rivers roll the stones down and leave them on West Coast beaches. Most pounamu comes from the land north of the Hokitika River, the home of Ngāti Waewae, the smallest hapū of Ngāi Tahu.
Different rivers give different stones. Māori gave each type a name from the world around them:
| Stone | What it looks like | Mainly found |
|---|---|---|
| Kawakawa | Emerald green to almost black, with dark flecks | Arahura and New rivers |
| Inanga | Milky grey-blue-white, named for whitebait | Arahura River and nearby creeks |
| Kahurangi | Bright apple green that glows when held to light | North of the Arahura, around Marsden |
| Kōkopu | Speckled browns, creamy whites and olive greens | Arahura and Taramakau rivers |
| Tahutahi | Green with white "snowflake" flecks | Cascade River, South Westland |
| Tangiwai | Glassier and softer; a stone called bowenite | Anita Bay and Poison Bay, Milford Sound |
How is greenstone formed? 🔥
Most pounamu is nephrite, a kind of jade. It formed millions of years ago, far below the surface. Two very different rocks, such as greywacke and dunite, were pressed together and heated until they fused into something new.
This happened along the Alpine Fault, where the Pacific and Australian plates push against each other. That same pressure built the Southern Alps. As the mountains rose, the new stone came up with them. Glaciers, landslides and rivers then broke pieces free and rolled them down into the riverbeds.
Inside, nephrite is made of tiny fibres of a mineral called tremolite, packed tightly together. That weave is why pounamu is so tough. It rates 6.5 on the Mohs hardness scale, just under quartz at 7, and its fibres make it very hard to break. Traces of iron and chromium set the green, from pale to nearly black.
Tangiwai is the exception. It is bowenite, a softer stone (about 5 on the same scale), and it is thought to be more than 500 million years old. That makes it the oldest pounamu known in New Zealand.
The story of Poutini and Waitaiki 🌙
Māori tradition tells a different origin, and West Coast place names still carry it. Tellers vary in the details. Here it is as Te Papa and the Māori oral history atlas share it.
The taniwha Poutini came to Tūhua, Mayor Island, and saw the beautiful Waitaiki bathing. Enchanted, he carried her south, lighting fires along the way to keep her warm. Her husband, Tamaahua, followed with the help of a magic dart. Wherever Poutini had lit a fire, Tamaahua found precious stone.
The chase ran past the Arahura River as far as Piopiotahi, Milford Sound. When Tamaahua turned back to the Arahura, he found Waitaiki in the riverbed. She had become smooth inanga pounamu, the mother lode of all greenstone. Poutini still swims up and down the coast, guarding the people and the mauri, the life force, of pounamu. That is why the West Coast is called Te Tai o Poutini, the tides of Poutini.
What does raw greenstone look like on the beach? 🔮
Here is the surprise: raw pounamu often doesn't look green at all. River tumbling leaves many stones with a chalky white or pale skin. Underneath, the stone can glow a deep, luminous green.
West Coast guides say to look for these clues:
- Chalky white or whitish-green stones. The green often hides under the skin.
- Colour that is not all green. Pounamu runs from near-black to milky grey, and kōkopu is speckled brown.
- A glow at the edges. Many pieces let light through, especially once polished.
- A look-alike to know. Serpentine can look similar, but it is not as tough.
For Arahura whānau, a flood has long meant a walk along their river to see what it brought down. On a public beach, most green pebbles turn out to be something else. Carvers spend years learning to read them.
Can you pick up greenstone on the beach? ✋
Sometimes, and only a little. Since 1997, natural pounamu in the Ngāi Tahu takiwā has belonged to Te Rūnanga o Ngāi Tahu. The Ngāi Tahu (Pounamu Vesting) Act returned it to the iwi as part of its Treaty settlement.
Ngāi Tahu Pounamu says the only public fossicking area is the stretch from Cobden beach to Rapahoe beach, near Greymouth. It says all other West Coast beaches and all rivers are private, open only to people of Ngāti Waewae or Makaawhio descent. Other guides describe it more loosely as "designated West Coast beaches", so check local signs or ask before you pocket anything.
Where fossicking is allowed, you can keep only what you can carry by yourself, without help. Pounamu in rivers can't be taken without permission from mana whenua. If you find a big piece, leave it where it lies.
How to tell where your greenstone came from 💎
"Greenstone" is also a loose word for green rocks from many countries. Nephrite is found overseas too, and both local pounamu and imported jade are carved and sold in New Zealand. So a green pendant alone doesn't tell you where its stone began.
Ask the seller three questions:
- What is the stone? Nephrite pounamu, tangiwai, or jade from elsewhere?
- Where was it found and carved? A good seller will tell you.
- Is there a trace code? Authentic Ngāi Tahu Pounamu carries a mark and a unique code. Enter it online to see the stone's origin, whakapapa and carver.
Many of our greenstone listings say the stone is locally sourced and locally carved, and handmade in the South Island. Our listings don't show the Ngāi Tahu mark or a trace code. If a listing doesn't say, or you'd like more detail, ask us and we'll check with our supplier. Our guide to jade vs greenstone goes deeper into the labels.
Choosing a piece with its story in mind
Once you know the stone's journey, the shape is the next choice. Our greenstone meaning finder matches a shape to the wish behind your gift. The greenstone designs guide explains each form.
Pendants in our greenstone collection start around NZ$45 for the simple pounamu pendant shown near the top. Carved hei tiki start at NZ$80 for the small size and NZ$95 for the 30 x 18 mm one. Matte toki start at NZ$220. For a home centrepiece, the standing double twist is 13 cm tall at NZ$780.
Pounamu is tough, but it is dense and can crack if dropped on a hard floor. Wear it often and your skin's natural oils will slowly polish it. You can see pieces in person at our shop in Westfield Manukau, Auckland, or we'll ship across New Zealand. When the moment comes, our guide on how to bless a greenstone necklace will help you start it well.
Greenstone origin questions
Is greenstone only found in New Zealand?
Pounamu, the stone Māori treasure as taonga, comes only from Te Waipounamu, the South Island. Nephrite jade is found in other countries too, and "greenstone" can mean other green rocks. That is why it pays to ask a seller where the stone was found.
Is greenstone the same as jade?
Mostly, yes. Most pounamu is nephrite, one of the two stones called jade. Tangiwai is bowenite, a different and softer stone. Jadeite, the other jade, is not found in Aotearoa. Our jade vs greenstone guide explains the labels.
How long does greenstone take to form?
Millions of years. Nephrite formed slowly under heat and pressure deep underground, then rode up with the rising Southern Alps. Tangiwai is thought to be older still, at more than 500 million years.
Which pounamu is the rarest?
Tangiwai is very rare and comes mainly from two bays in Milford Sound. Among the nephrite types, carvers name tahutahi, the "snowflake" stone from the Cascade River, as one of the rarest. Kahurangi, the bright apple-green stone, is rare too.
Why is the South Island called Te Waipounamu?
It means the greenstone waters. Pounamu was so valued that passes over the Southern Alps became trails for carrying it from its sources, and waka carried more along the coast.
Before you go
From deep rock to a riverbed to your hand, every piece has travelled a long way. 🌿 Choose one whose journey you'd love to keep telling.
Sources
- Te Papa — formation of pounamu and the origins of pounamu: Poutini.
- LEARNZ — geology of pounamu.
- NZ Association of Science Educators — pounamu science backgrounder.
- Toitū Te Whenua LINZ — Poutini, a guardian taniwha.
- Ngāi Tahu (Pounamu Vesting) Act 1997; RNZ — buying and gifting pounamu.
- Ngāi Tahu Pounamu — FAQ and caring for your pounamu.
- Moko Pounamu — where pounamu is found; Mountain Jade — types of pounamu.
- NZ Herald — searching for greenstone in Hokitika, with guide Te Rua Mason.