Heulandite-Sr is a rare member of the zeolite group characterized by its strontium dominance. It is most easily identified by its distinctive coffin-shaped tabular crystals typically found in basaltic cavities and amygdules.

Hardness

3-4

Mohs

Luster

Vitreous

Streak

White

Transparency

Translucent

mineralrareHeulandite Subgroup family

Heulandite-Sr

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

No image

Is this heulandite-sr?

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-sr with a known reference. Heulandite-Sr 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-Sr leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Heulandite-Sr typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: white, colorless, gray, pink, yellow.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: tabular crystals, coffin-shaped, crusts.

Often confused with

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

Often found alongside heulandite-sr

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

All properties

Chemical formula: (Sr,Ca,Na,K)₂Al₃(Al,Si)₂Si₁₃O₃₆·12H₂O
Mohs hardness: 3-4
Density: 2.2-2.3 g/cm³
Colors: White Colorless Gray Pink Yellow
Streak: White
Luster: Vitreous
Transparency: Translucent
Crystal system: Monoclinic
Crystal habit: Tabular Crystals, Coffin-shaped, Crusts
Cleavage: Perfect On {010}
Rarity: Rare
Uses: Collector
Host rock: Volcanic Rocks, Basalts
Typical price: $20-150 per specimen

Where rockhounds find heulandite-sr

Classic worldwide localities

Scotland
Japan
USA
Iceland
Germany

Field-hunting tip

Look in volcanic rocks, basalts country — that is the host setting where heulandite-sr typically forms. If you start seeing calcite, analcime, quartz 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-sr?+

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

Where is heulandite-sr found?+

Notable localities include Scotland; Japan; USA; Iceland; Germany.

How much is heulandite-sr worth?+

Typical asking prices fall in the range of $20-150 per specimen. Quality, size, and provenance can move individual specimens well outside that range.

What rocks look like heulandite-sr?+

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

What minerals are found with heulandite-sr?+

Heulandite-Sr commonly co-occurs with Calcite, Analcime, Quartz, Mesolite. Spotting any of these in float or country rock is a useful trip signal.

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

Heulandite-Sr typically forms in volcanic rocks, basalts. Working float back to the host body is the standard way to chase a fresh occurrence.

What is heulandite-sr used for?+

Heulandite-Sr is used in collector.

Find heulandite-sr on the map

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