Turquoise Identification Guide

Identify genuine turquoise by its sky-blue to green color, waxy luster, matrix veining, hardness, and how to separate it from dyed howlite and imitations.

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What Turquoise Looks Like

Turquoise is a hydrated copper aluminium phosphate. It is an opaque, sky-blue to green gemstone, often crossed by a web of dark veining (the host-rock "matrix"). The blue comes from copper; green tones come from iron substituting for aluminium.

Color: Sky blue, robin's-egg blue, blue-green, to apple green. Often mottled with brown, black, or tan matrix.
Luster: Waxy to subvitreous; dull when unpolished.
Transparency: Opaque.
Habit: Almost always massive, cryptocrystalline, as nodules, veins, and crusts; rarely as tiny crystals.

Field-ID Checklist

Note the distinctive blue to blue-green color.
Look for matrix veining (spiderweb of brown/black host rock).
Check luster — waxy, not glassy.
Test hardness — 5 to 6; can be scratched by a steel file but not by a copper coin.
Confirm opacity — turquoise is never transparent.
Be wary of perfect uniformity — too-perfect color and webbing can indicate imitation.

Key Diagnostic Tests

Mohs hardness: 5–6 (softer in chalky, porous material). A knife may scratch lower-grade stone; quality turquoise resists a copper coin.
Streak: White to pale greenish.
Cleavage/fracture: Cleavage rarely seen in massive material; conchoidal to smooth fracture.
Acid test: Slowly soluble in heated hydrochloric acid (not a casual field test).
Density: ~2.6–2.9 (lower in porous specimens).
Acetone/dye test: A cotton swab with acetone or nail-polish remover will pull color off dyed imitations but not stain genuine, untreated turquoise.

Common Look-Alikes

Dyed howlite or magnesite: The most common fakes — naturally white with gray veining, dyed blue. Softer (Mohs 3.5), and dye can transfer to an acetone swab or show concentrated color in cracks.
Reconstituted/block turquoise: Powdered turquoise or other material bound with resin and dye; may smell of plastic when hot-needle tested and looks too uniform.
Chrysocolla: Another copper mineral, blue-green but generally softer and sometimes more translucent.
Variscite: A green aluminium phosphate look-alike; usually greener and with different matrix.
Plastic/glass/ceramic imitations: Lack natural matrix variation, may show molding marks or bubbles, and feel warmer and lighter.
Larimar: Blue pectolite with a different, streaky white pattern and higher hardness inconsistency.

Where It's Found

Turquoise forms in arid, copper-rich regions where groundwater alters aluminous rocks. Historic and major sources include Iran (Nishapur, famed for fine sky-blue stone), the southwestern United States (Arizona, Nevada, New Mexico — including Sleeping Beauty and Kingman mines), China, Egypt (Sinai), and Mexico. It is typically found as veins and nodules in weathered volcanic and sedimentary host rocks.

Frequently asked questions

How can you tell if it's real turquoise?

Genuine turquoise is opaque blue to blue-green with a waxy luster, hardness 5–6, and natural irregular matrix veining. It resists scratching by a copper coin, and an acetone swab will not pull off color the way it does on dyed howlite imitations.

What is the difference between turquoise and dyed howlite?

Howlite is naturally white with gray veins and is soft (Mohs 3.5); when dyed blue it can be scratched easily, its dye may rub off on an acetone swab, and color often pools in the cracks. Turquoise is harder and naturally colored throughout.

What does real turquoise look like?

Real turquoise is an opaque sky-blue to green stone with a soft waxy sheen, usually crossed by a natural web of brown or black matrix, with subtle color variations rather than perfectly uniform color.

Is turquoise hard or soft?

Turquoise is relatively soft for a gemstone, around Mohs 5–6, so it can scratch and is often stabilized with resin to improve durability; porous, chalky material is softer still.

How do you test turquoise at home?

Rub an inconspicuous spot with a cotton swab dipped in acetone — dye from fake stones transfers to the swab, while genuine untreated turquoise does not. Also check that it is opaque, waxy, and harder than a copper coin, and look for natural, irregular matrix.

Turquoise identified by the community

Recent Turquoise specimens identified with Rock Identifier.