Treasurite is an exceptionally rare carbonate mineral primarily known from the alkaline igneous complex at Mont Saint-Hilaire. It typically occurs as small, delicate tabular crystals associated with other rare mineral species in vugs and cavities.

Hardness

3.5

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrare

Treasurite

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

Is this treasurite?

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 treasurite with a known reference. Treasurite 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. Treasurite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Treasurite typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: colorless, white, gray.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: tabular crystals.

Often confused with

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

How to tell apart: Luster reads vitreous on Treasurite and pearly on Dawsonite.

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Often found alongside treasurite

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

All properties

Chemical formula: Na₂Ca₄(CO₃)₅
Mohs hardness: 3.5
Density: 2.9-3.0 g/cm³
Colors: Colorless White Gray
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Monoclinic
Crystal habit: Tabular Crystals
Cleavage: Perfect
Rarity: Rare
Uses: Collector
Host rock: Alkaline Igneous Intrusions
Typical price: $50-300 per specimen

Where rockhounds find treasurite

Classic worldwide localities

Mont Saint-Hilaire, Quebec, Canada

Field-hunting tip

Look in alkaline igneous intrusions country — that is the host setting where treasurite typically forms. If you start seeing analcime, siderite, microcline 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 treasurite?+

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

Where is treasurite found?+

Notable localities include Mont Saint-Hilaire, Quebec, Canada.

How much is treasurite 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 treasurite?+

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

What minerals are found with treasurite?+

Treasurite commonly co-occurs with Analcime, Siderite, Microcline. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does treasurite form in?+

Treasurite typically forms in alkaline igneous intrusions. Working float back to the host body is the standard way to chase a fresh occurrence.

What is treasurite used for?+

Treasurite is used in collector.

Find treasurite on the map

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