Bone vs Nacre
Bone and Nacre are genuine alternatives to one another — a choice somebody actually makes — and differ on 1 measured property, density most clearly.
Bone vs Nacre
Bone
Mineral crystals grown on a protein scaffold — stiff like a ceramic and tough like a polymer, which no engineered material manages at once.
Nacre
Aragonite bricks in a protein mortar — a ceramic three thousand times tougher than the mineral it is made of, and the most-copied structure in materials science.
| Property | Bone | Nacre |
|---|---|---|
| Density | 1.8–2.1 g/cm³ | 2.6–2.85 g/cm³ higher |
| Mohs hardness Only one of the two has a figure we can stand behind, so there is nothing to compare. | Not known | 2.5–4.5 |
| Tensile strength Only one of the two has a figure we can stand behind, so there is nothing to compare. | 100–150 MPa | Not known |
| Young's modulus Only one of the two has a figure we can stand behind, so there is nothing to compare. | 15–25 GPa | Not known |
Choosing between them
Nacre is recorded as a substitute for Bone — easier to work.
What it gives up: Comes only in thin curved sheets the size of the shell it was cut from, so it inlays and it does not carve — bone gives a solid block and nacre never does.
In this application, on the evidence cited above.