Moonstone vs Rose quartz
Moonstone and Rose quartz are commonly confused, and 3 measured properties separate them — crystal system most clearly.
Moonstone vs Rose quartz
Moonstone
Feldspar with a blue-white glow that floats under the surface — and it is two intergrown feldspars scattering light between them.
Rose quartz
Pink quartz, and the colour is microscopic fibres of another mineral inside it rather than an impurity in the quartz.
| Property | Moonstone | Rose quartz |
|---|---|---|
| Crystal system Categorical values can be listed side by side but not ordered or subtracted. | monoclinic | trigonal |
| Density | 2.56–2.62 g/cm³ | 2.65–2.66 g/cm³ higher |
| Mohs hardness Mohs hardness is an ordinal scale: values can be ranked, but differences and ratios between them are not meaningful. | 6–6.5 | 7 higher |
Why these get confused
both translucent and cabochon-cut; moonstone has two cleavages and a directional glow where rose quartz has neither
The confusion is a real and documented one, not a resemblance we have invented.