Comparison · Oxide Minerals vs Silicate Minerals
Rutile vs Staurolite
Rutile and Staurolite are easy to confuse. Both sit near Mohs 6.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Rutile and Staurolite
- Both sit near Mohs 6.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Streak color differs: Rutile leaves a pale brown to yellowish streak on unglazed porcelain, Staurolite leaves white to grayish.
- Rutile feels noticeably heavier for its size (specific gravity 4.25 versus 3.7 for Staurolite).
- They overlap in brown, red, and black, but Rutile also comes in yellow.
- Well-formed crystals give it away: Rutile is tetragonal, Staurolite is monoclinic.
Rutile vs Staurolite properties
| Property | Rutile | Staurolite |
|---|---|---|
| Type | Oxide Minerals | Silicate Minerals |
| Mohs hardness | 6.5 | 7.25 |
| Luster | adamantine | vitreous |
| Streak | Pale brown to yellowish | White to grayish |
| Transparency | translucent | translucent |
| Specific gravity | 4.25 | 3.7 |
| Crystal system | tetragonal | monoclinic |
| Common colors | Reddish brown, Black, Golden yellow, Red | Reddish brown, Brown, Dark brown, Black |
| Rarity | common | uncommon |
| Typical specimen value | $10–$600+ | $5–$300+ |
Which is more valuable?
Rutile is usually the more valuable of the two: a typical collector specimen runs about $80 against $45 for Staurolite, and premium Rutile can reach $600 or more.
About Rutile
Rutile is a titanium dioxide mineral known for its high luster, deep reddish-brown to black color, and slender prismatic or needle-like crystals. It frequently occurs as golden or coppery needle inclusions within quartz, producing the popular rutilated quartz.
About Staurolite
Staurolite is an iron aluminum silicate famous for its cross-shaped twinned crystals. It forms reddish-brown to nearly black prismatic crystals in metamorphic schists and is a classic index mineral of medium-grade metamorphism.
Rutile vs Staurolite FAQ
Is Rutile the same as Staurolite?
No. Rutile is a oxide mineral while Staurolite is a silicate mineral. Both sit near Mohs 6.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Rutile from Staurolite?
Both sit near Mohs 6.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Streak color differs: Rutile leaves a pale brown to yellowish streak on unglazed porcelain, Staurolite leaves white to grayish. Rutile feels noticeably heavier for its size (specific gravity 4.25 versus 3.7 for Staurolite).
Which is harder, Rutile or Staurolite?
Staurolite is harder: Mohs 7.25 against Mohs 6.5 for Rutile.
Which is more valuable, Rutile or Staurolite?
Rutile is usually the more valuable of the two: a typical collector specimen runs about $80 against $45 for Staurolite, and premium Rutile can reach $600 or more.
