Direnzoite is an extremely rare member of the zeolite group found in specific volcanic environments. It typically occurs as small tabular crystals associated with other zeolites and calcite in vesicle-filled cavities.

Hardness

3.5

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrareZeolite Group family

Direnzoite

Hardness: 3.5
Luster: Vitreous
Streak: White
Transparency: Transparent

No image

Is this direnzoite?

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 direnzoite with a known reference. Direnzoite sits at Mohs 3.5 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Direnzoite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Direnzoite 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: orthorhombic. Typical habit: tabular crystals.

Often confused with

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

mineral

Natrolite

Mohs 5-5.5

How to tell apart: Natrolite is the harder of the two (Mohs 5-5.5 vs. 3.5).

Often found alongside direnzoite

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

All properties

Chemical formula: Na₄K₄Ca₂Si₂₀Al₈O₅₆·14H₂O
Mohs hardness: 3.5
Density: 2.16 g/cm³
Colors: Colorless White
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Orthorhombic
Crystal habit: Tabular Crystals
Cleavage: None
Rarity: Rare
Uses: Collector
Host rock: Volcanic Rocks
Typical price: $50-300 per specimen

Where rockhounds find direnzoite

Classic worldwide localities

Italy

Field-hunting tip

Look in volcanic rocks country — that is the host setting where direnzoite typically forms. If you start seeing calcite, phillipsite, chabazite 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 direnzoite?+

Mohs hardness is 3.5. It typically shows a vitreous luster. The streak is white. Common colors include colorless, white.

Where is direnzoite found?+

Notable localities include Italy.

How much is direnzoite 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 direnzoite?+

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

What minerals are found with direnzoite?+

Direnzoite commonly co-occurs with Calcite, Phillipsite, Chabazite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does direnzoite form in?+

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

What is direnzoite used for?+

Direnzoite is used in collector.

Find direnzoite on the map

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