Royston Turquoise is a highly sought-after variety from the Royston mining district in Nevada, prized for its distinctive blue-to-green coloration and complex, often dark brown web-like matrix. It typically occurs in massive, opaque forms and is widely used in high-end lapidary work for its unique natural aesthetics. Collectors favor specimens that showcase a balanced contrast between the vibrant turquoise mineral and the intricate host rock inclusions.
Is this royston turquoise?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch royston turquoise with a known reference. Royston Turquoise sits at Mohs 5-6, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Streak: white.
- 3Read the lusterHold the specimen under a strong light. Luster: waxy.
- 4Match the color rangeCompare against the expected color range: blue, green, brown, tan.
- 5Look at form & habitCrystal system: triclinic. Typical habit: massive.
Often confused with
Royston Turquoise vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Royston Turquoise is noticeably harder (Mohs 5-6 vs. ~2-4); luster reads waxy on Royston Turquoise and vitreous, porcelaneous, earthy on Chrysocolla.
How to tell apart: Luster reads waxy on Royston Turquoise and vitreous to waxy on Variscite.
How to tell apart: Luster reads waxy on Royston Turquoise and vitreous, may be pearly on Smithsonite.
Often found alongside royston turquoise
Minerals reported to co-occur with royston turquoise. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- CuAl₆(PO₄)₄(OH)₈·4H₂O
- Mohs hardness
- 5-6
- Density
- 2.6-2.9 g/cm³
- Streak
- White
- Luster
- Waxy
- Transparency
- Opaque
- Crystal system
- Triclinic
- Crystal habit
- Massive
- Cleavage
- None
- Rarity
- Uncommon
- Uses
- Gemstone, Lapidary, Collector, Decorative
- Host rock
- hydrothermal alteration zones in volcanic rocks
Where rockhounds find royston turquoise
Classic worldwide localities
- Royston mining district, Nevada, USA
Field-hunting tip
Where it forms: hydrothermal alteration zones in volcanic rocks. If you start seeing quartz, limonite, pyrite in float, you are in the right ground. Typical habit: massive. Train your eye for that shape before scanning the outcrop.
Common questions
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Find royston turquoise on the map
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