Specimen at a glance
| Mineral | Petrified wood (silicified) |
|---|---|
| Chemistry | SiO2 (quartz and chalcedony) |
| Mohs hardness | 6.5–7 |
| Crystal system | Microcrystalline quartz |
| Locality | Long Island, New York |
| You receive | The exact specimen pictured |
About this specimen
Petrified wood forms when buried wood is infiltrated by silica-rich groundwater over long spans of time; the silica gradually replaces the original organic cell structure, cell by cell, preserving the wood’s grain, growth rings, and texture in stone. This piece shows that replacement clearly in its banded, fibrous surface pattern.
Long Island itself is not a classic in-situ petrified wood locality — the island is built from glacial outwash and moraine material left behind roughly 20,000 years ago as the last ice sheet retreated, which means pieces like this one arrived as glacially transported material, likely carried down from older fossil-wood-bearing deposits farther north or reworked from Coastal Plain sediments. Finding petrified wood on a Long Island beach or bluff is as much a story about glacial history as it is about the tree it once was.
Petrified wood typically registers around 6.5-7 on the Mohs scale, since it is essentially chalcedony/quartz in wood’s original form, making it quite durable for handling. A soft cloth is all it needs for cleaning — no chemicals or ultrasonic cleaning necessary.
Inside Petrified Wood
Same tree, same growth rings — just replaced, atom by atom, with stone.
The story: Before a buried log can fully decay, silica-rich groundwater soaks through its cell structure and slowly deposits quartz and chalcedony in place of the original wood, molecule by molecule. The mineral takes over so precisely that growth rings, bark texture, and sometimes even insect damage survive perfectly preserved in solid stone.
Why collectors chase it: It’s a genuine fossil you can hold and handle like any other mineral specimen — wood grain rendered permanent, sometimes in vivid mineral-stained color.
Care: Durable like the quartz it’s made of; safe for regular display and handling, soft dry cloth to clean.
Petrified wood: the science
- Petrified wood is a pseudomorph: stone in the exact shape of the wood it replaced, sometimes down to individual cells.
- Iron and manganese in the groundwater add the reds, yellows, and blacks.
- Petrifaction needs fast burial with little oxygen, such as under volcanic ash or river sediment, so the wood mineralizes before it rots.
Go deeper
Want the full story on petrified wood: how it forms, how to identify it, and what makes a great specimen?
Read Petrified Wood: The Complete Guide Shop all Petrified Wood
Questions about this piece
What is petrified wood?
Petrified wood is a fossil. Buried wood was infiltrated by silica-rich groundwater, and quartz slowly replaced the organic material, often preserving growth rings and cell structure.
Where was it found?
This piece comes from Long Island, New York. We list a locality whenever it is known, because where a mineral formed is part of its story and its value.
How hard is it, and how should I care for it?
It rates 6.5–7 on the Mohs scale. Very durable at around Mohs 7. Dust or rinse and air dry. Polished faces can be wiped with a soft cloth.
Is this the exact piece I will receive?
Yes. This listing was photographed individually, and you receive the exact piece shown in the photos.
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