If you’ve ever seen onyx stone featured in an interior design project, you might have mistaken it for another material we know extremely well at Arastone: alabaster. And yes, at first glance, both stones share similar visual qualities…
But just like there are clear differences between marble and alabaster, there are also multiple factors that set onyx apart from unmistakable alabaster. In this article, we’ll explain what these differences are and when it’s more appropriate to choose one or the other depending on the type of atmosphere you’re aiming for in your project.
Characteristics of onyx
The best way to understand the differences between the two is by looking at the characteristics of each material. Starting with onyx, it is a semi-precious stone rich in silica, as it is mainly composed of silicon dioxide (SiO₂). It is considered a variety of agate or chalcedony.
There are different types of onyx, some of which are more opaque, while others are slightly translucent. In terms of color, onyx can be black, green, yellow, orange, and more. It often features bands or layers of mixed colors.
Where is onyx used? Primarily in jewelry, but also in architecture and interior design.
Key differences between onyx and alabaster
So, what exactly sets onyx and alabaster apart? The truth is, there are several differences—here are the most important:
- Composition. While onyx is composed of silicon dioxide, alabaster is primarily made of hydrated calcium sulfate.
- Origin. Onyx is formed in volcanic deposits, whereas alabaster forms in sedimentary deposits.
- Appearance. Onyx offers a wide color range and varying degrees of translucency: some stones are completely opaque, while others let a small amount of light through—though never as much as alabaster. Alabaster, usually white or with soft light-colored veining, stands out for its high translucency, far greater than any form of onyx.
- Hardness. One of the most notable properties of onyx is its hardness, ranging from 6.5 to 7 on the Mohs scale, compared to just 2 for alabaster. This means onyx is more resistant to surface scratches, but alabaster is much easier to carve.
- Uses. The properties of each stone define their typical applications: onyx is used in interior decoration, cladding, and jewelry, while alabaster is more often found in exclusive architectural projects, wall and ceiling panels, sculptures, artworks, lamps, and lighting design, thanks to its translucency and aesthetic value.
Applications in interior design projects
In the field of interior design, these are the most common uses for each stone:
- Onyx is used for kitchen and bathroom countertops, decorative wall claddings in living and dining areas, accent pieces, and ornamental flooring.
- Alabaster is ideal for wall and ceiling panels, translucent partitions that maximize natural light, decorative lighting, backlit panels and features, lamps, sculptures, and high-end decorative furniture.
When to choose alabaster or onyx for a luxury project
Regardless of their application, both materials—thanks to their unique beauty and character—can elevate and transform interior design. But when should you choose one over the other?
Onyx is an excellent choice when your goal is to create bold, eye-catching spaces, while alabaster is perfect for those seeking a softer, more refined aesthetic.
With its superior translucency, alabaster produces gentle lighting effects, bringing warmth, elegance, and a distinct handcrafted quality to any environment.
If you ultimately choose alabaster for your luxury project, remember that at Arastone we offer custom-made alabaster panels, as well as slices of alabaster, bricks, and blocks sourced from our own quarries in Aragón.
That means we can provide you with a tailor-made, high-quality solution for your project—so don’t wait any longer. Contact us today if you’re interested.