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, 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.