Ghiaraite is an extremely rare fluoride mineral originally discovered in the volcanic environment of Mount Vesuvius. It typically appears as small, colorless tabular crystals formed in fumarolic deposits. Due to its rarity and specific chemical requirements, it is primarily found in specialized mineral collections.

Hardness

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrare

Ghiaraite

Hardness: 2
Luster: Vitreous
Streak: White
Transparency: Transparent

No image

Is this ghiaraite?

5-step field check

Run through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.

1
Test the hardness
Try to scratch ghiaraite with a known reference. Ghiaraite sits at Mohs 2 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Ghiaraite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Ghiaraite typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: colorless, white.
5
Look at form & habit
Crystal system: trigonal. Typical habit: tabular crystals.

Often confused with

Ghiaraite vs. its common look-alikes — and how to tell them apart in the field.

mineral

Fluorite

Mohs 4

How to tell apart: Fluorite is the harder of the two (Mohs 4 vs. 2).

Often found alongside ghiaraite

Minerals reported to co-occur with ghiaraite. Spotting these in float or country rock is a strong cue you are in the right ground.

All properties

Chemical formula: Na₂CaF₄
Mohs hardness: 2
Density: 2.44 g/cm³
Colors: Colorless White
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Trigonal
Crystal habit: Tabular Crystals
Cleavage: Perfect
Rarity: Rare
Uses: Collector
Host rock: Volcanic Fumaroles
Typical price: $50-300 per specimen

Where rockhounds find ghiaraite

Classic worldwide localities

Vesuvius, Italy

Field-hunting tip

Look in volcanic fumaroles country — that is the host setting where ghiaraite typically forms. If you start seeing fluorite, glauberite, halite in float, you are in the right ground. Field specimens usually show a tabular crystals habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify ghiaraite?+

Mohs hardness is 2. It typically shows a vitreous luster. The streak is white. Common colors include colorless, white.

Where is ghiaraite found?+

Notable localities include Vesuvius, Italy.

How much is ghiaraite worth?+

Typical asking prices fall in the range of $50-300 per specimen. Quality, size, and provenance can move individual specimens well outside that range.

What rocks look like ghiaraite?+

Ghiaraite is most often confused with Fluorite, Glauberite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with ghiaraite?+

Ghiaraite commonly co-occurs with fluorite, glauberite, halite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does ghiaraite form in?+

Ghiaraite typically forms in volcanic fumaroles. Working float back to the host body is the standard way to chase a fresh occurrence.

What is ghiaraite used for?+

Ghiaraite is used in collector.

Find ghiaraite on the map

RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.