Balestraite is a rare phyllosilicate mineral that forms as thin, platy crystals, primarily known from the alkaline intrusive complex at Mont Saint-Hilaire. Collectors look for its characteristic micaceous habit and pearly luster in association with rare-earth minerals in pegmatite vugs.

Hardness

2.5-3

Mohs

Luster

Pearly

Streak

White

Transparency

Transparent

mineralrareMicas Group family

Balestraite

Hardness: 2.5-3
Luster: Pearly
Streak: White
Transparency: Transparent

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Is this balestraite?

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 balestraite with a known reference. Balestraite sits at Mohs 2.5-3 — softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Balestraite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Balestraite typically shows a pearly luster.
4
Match the color range
Compare against the expected color range: colorless, white.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: platy crystals, micaceous aggregates.

Often confused with

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

Often found alongside balestraite

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

All properties

Chemical formula: KLi₂NaTi₂Si₈O₁₈F(OH)
Mohs hardness: 2.5-3
Density: 2.62 g/cm³
Colors: Colorless White
Streak: White
Luster: Pearly
Transparency: Transparent
Crystal system: Monoclinic
Crystal habit: Platy Crystals, Micaceous Aggregates
Cleavage: Perfect Basal
Rarity: Rare
Uses: Collector
Host rock: Alkaline Igneous Rocks, Pegmatites
Typical price: $50-300 per specimen

Where rockhounds find balestraite

Classic worldwide localities

Mont Saint-Hilaire, Quebec, Canada

Field-hunting tip

Look in alkaline igneous rocks, pegmatites country — that is the host setting where balestraite typically forms. If you start seeing aegirine, microcline, analcime in float, you are in the right ground. Field specimens usually show a platy crystals, micaceous aggregates habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify balestraite?+

Mohs hardness is 2.5-3. It typically shows a pearly luster. The streak is white. Common colors include colorless, white.

Where is balestraite found?+

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

How much is balestraite 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 balestraite?+

Balestraite is most often confused with Muscovite, Lepidolite, Polylithionite. A quick hardness test and a streak check separate the look-alikes faster than color alone.

What minerals are found with balestraite?+

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

What kind of rock does balestraite form in?+

Balestraite typically forms in alkaline igneous rocks, pegmatites. Working float back to the host body is the standard way to chase a fresh occurrence.

What is balestraite used for?+

Balestraite is used in collector.

Find balestraite on the map

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