Heulandite-Na is a common member of the zeolite group often recognized by its distinct coffin-shaped crystal habit. Collectors prize it for its excellent association with other zeolites in basaltic vugs, typically forming clusters of tabular, pearly-lustered crystals.

Hardness

3-4

Mohs

Luster

Vitreous

Streak

White

Transparency

Translucent

mineralcommonHeulandite family

Heulandite-Na

Hardness: 3-4
Luster: Vitreous
Streak: White
Transparency: Translucent

No image

Is this heulandite-na?

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 heulandite-na with a known reference. Heulandite-Na sits at Mohs 3-4 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Heulandite-Na leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Heulandite-Na typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: white, colorless, yellow, pink, orange, brown.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: tabular crystals, coffin-shaped, crusts.

Often confused with

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

Often found alongside heulandite-na

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

All properties

Chemical formula: (Na,Ca)₂₋₃Al₃(Al,Si)₂Si₁₃O₃₆·12H₂O
Mohs hardness: 3-4
Density: 2.1-2.2 g/cm³
Colors: White Colorless Yellow Pink Orange Brown
Streak: White
Luster: Vitreous
Transparency: Translucent
Crystal system: Monoclinic
Crystal habit: Tabular Crystals, Coffin-shaped, Crusts
Cleavage: Perfect On {010}
Rarity: Common
Uses: Collector
Host rock: Basalt Cavities, Volcanic Amygdales
Typical price: $10-100 depending on specimen size and clarity

Where rockhounds find heulandite-na

Classic worldwide localities

Nasik, India
Teigarhorn, Iceland
Fairfax Quarry, Virginia, USA
Bay of Fundy, Nova Scotia, Canada

Field-hunting tip

Look in basalt cavities, volcanic amygdales country — that is the host setting where heulandite-na typically forms. If you start seeing quartz, apophyllite, calcite in float, you are in the right ground. Field specimens usually show a tabular crystals, coffin-shaped, crusts habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify heulandite-na?+

Mohs hardness is 3-4. It typically shows a vitreous luster. The streak is white. Common colors include white, colorless, yellow, pink.

Where is heulandite-na found?+

Notable localities include Nasik, India; Teigarhorn, Iceland; Fairfax Quarry, Virginia, USA; Bay of Fundy, Nova Scotia, Canada.

How much is heulandite-na worth?+

Typical asking prices fall in the range of $10-100 depending on specimen size and clarity. Quality, size, and provenance can move individual specimens well outside that range.

What rocks look like heulandite-na?+

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

What minerals are found with heulandite-na?+

Heulandite-Na commonly co-occurs with Quartz, Apophyllite, Calcite, Stilbite, Laumontite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does heulandite-na form in?+

Heulandite-Na typically forms in basalt cavities, volcanic amygdales. Working float back to the host body is the standard way to chase a fresh occurrence.

What is heulandite-na used for?+

Heulandite-Na is used in collector.

Find heulandite-na on the map

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