Morado Opal Identification Guide

What Morado Opal Looks Like

Morado opal (Spanish morado = purple), also marketed as "Violet Flame opal," is a purple variety of common opal from Mexico. It is opaque to translucent and ranges from pale lilac and lavender to deep grape-purple, often mottled with white, gray, or brownish patches. Unlike precious opal, it shows no rainbow play-of-color — its appeal is the solid purple body color.

• Color: lavender to deep purple, often patchy with white/gray
• Luster: waxy to vitreous
• Transparency: opaque to translucent
• Habit: massive; cut as cabochons, beads, tumbles

Step-by-Step Field ID Checklist

1. Confirm it is common opal. Look for solid purple color with NO flashing play-of-color — morado is a common (potch) opal.
2. Check hardness: Mohs 5.5–6.5 — softer than quartz; a steel file or quartz point will scratch it, and it only weakly scratches glass.
3. Note the waxy luster and conchoidal fracture typical of opal/silica gel.
4. Look for natural mottling — purple blended with cream, gray, or brown patches.
5. Watch for fading. Some morado can lighten with prolonged sun/heat exposure, a clue to its natural opal nature.

Key Diagnostic Tests

• Hardness: 5.5–6.5 (softer than quartz at 7 — a key separator from amethyst).
• Fracture: conchoidal; no cleavage.
• Specific gravity: ~2.0–2.2 (low; lighter than quartz).
• Acid: no reaction.
• No play-of-color under a point light source.

Common Look-Alikes and How to Tell Them Apart

• Amethyst (purple quartz): harder (7) and usually transparent/crystalline; amethyst will scratch glass cleanly and morado will not. Amethyst is also denser.
• Purple chalcedony / lavender agate: harder (~7) and often translucent with waxier sheen; a hardness test separates them.
• Tiffany Stone (bertrandite/opalized fluorite): a bluish-purple Utah material with more complex banding and harder fluorite zones.
• Dyed howlite/magnesite: much softer (3–3.5), with visible veining and dye that concentrates in cracks.
• Purple glass: has bubbles and a perfectly even color.

Where Morado Opal Is Found

Morado opal is mined in Mexico (notably in central Mexican states such as Michoacán and surrounding volcanic regions). It forms, like other opal, from silica-rich solutions filling cavities and seams in volcanic host rock, with its purple color attributed to trace inclusions such as manganese/fluorite-related coloring.

Forms, Treatments, and Field Notes

Morado opal is a common opal, so its value rests on body color and pattern rather than fire. It is sold as cabochons, beads, and tumbles, and the best pieces show an even, saturated grape-purple. Be aware of its tendency toward instability: like some other hydrated common opals it can lighten or develop fine surface crazing with heat and prolonged sunlight, so store and wear it gently and avoid ultrasonic cleaners.

Authentication checklist

Confirm morado with a layered approach — low density in the hand (~2.0–2.2, noticeably light), hardness 5.5–6.5 (it will NOT scratch glass cleanly the way amethyst does), waxy luster, and conchoidal fracture. The absence of any rainbow play-of-color rules out precious opal, while the low hardness rules out amethyst and purple chalcedony. Naturally mottled purple-with-cream zoning argues against dyed stones, which show dye pooling in cracks.