Mellizinkalite is an extremely rare potassium zinc chloride mineral primarily found in volcanic fumarole environments. It typically occurs as small, delicate cubic crystals or encrustations associated with other halide minerals in high-temperature volcanic vents.

Hardness

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrare

Mellizinkalite

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

No image

Is this mellizinkalite?

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 mellizinkalite with a known reference. Mellizinkalite 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. Streak: white.
3
Read the luster
Hold the specimen under a strong light. Luster: vitreous.
4
Match the color range
Compare against the expected color range: white, colorless.
5
Look at form & habit
Crystal system: triclinic.

Often confused with

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

Often found alongside mellizinkalite

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

All properties

Chemical formula: K₃Zn₂Cl₇
Mohs hardness: 2
Density: 2.49 g/cm³
Colors: White Colorless
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Triclinic
Cleavage: Poor
Rarity: Rare
Uses: Collector
Host rock: fumarole deposits

Where rockhounds find mellizinkalite

Classic worldwide localities

Mount Vesuvius, Italy

Field-hunting tip

Where it forms: fumarole deposits. If you start seeing vesuvianite, halite, sylvite in float, you are in the right ground.

Common questions

How do you identify mellizinkalite?+

Mohs hardness is 2. Luster: vitreous. The streak is white. Common colors include white, colorless.

Where is mellizinkalite found?+

Notable localities include Mount Vesuvius, Italy.

Is mellizinkalite safe to handle?+

Contains zinc and chlorides; avoid inhalation of dust and wash hands thoroughly after handling as it is a salt derivative.

What rocks look like mellizinkalite?+

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

What minerals are found with mellizinkalite?+

Mellizinkalite commonly co-occurs with Vesuvianite, Halite, Sylvite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does mellizinkalite form in?+

Where it forms: fumarole deposits. Working float back to the host body is the standard way to chase a fresh occurrence.

What is mellizinkalite used for?+

Mellizinkalite is used in collector.

Find mellizinkalite on the map

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