Berborite is a rare beryllium borate mineral typically found as small, thin, colorless platy crystals in alkaline pegmatite environments. Collectors should look for it in association with other beryllium-bearing minerals, often requiring microscopic examination for positive field identification due to its small crystal size.

Hardness

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent to translucent

mineralrare

Berborite

Hardness: 3
Luster: Vitreous
Streak: White
Transparency: Transparent to translucent

Is this berborite?

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 berborite with a known reference. Berborite sits at Mohs 3, softer than the next harder reference, harder than the previous one.
2
Check the streak
Drag the specimen across an unglazed porcelain plate. Streak: white.
3
Read the luster
Hold the specimen under a strong light. Luster: vitreous.
4
Match the color range
Compare against the expected color range: colorless.
5
Look at form & habit
Crystal system: hexagonal. Typical habit: platy crystals, tabular, massive.

Often found alongside berborite

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

All properties

Chemical formula: Be₂BO₃(OH)·H₂O
Mohs hardness: 3
Density: 2.03-2.06 g/cm³
Colors: Colorless
Streak: White
Luster: Vitreous
Transparency: Transparent to translucent
Crystal system: Hexagonal
Crystal habit: Platy crystals, tabular, massive
Cleavage: Perfect on {0001}
Rarity: Rare
Uses: Collector
Host rock: In serpentinized dolostone associated with W–Sr–B–Be-bearing skarns (Pitkäranta district, Russia); in vugs with natrolite (Saga quarry, Norway)

Where rockhounds find berborite

Classic worldwide localities

Luppikko deposit, Pitkäranta district, Lake Ladoga, Karelia, Russia
Saga and Tuften larvikite quarries, Tvedalen, and at Brønnebukta, Siktesøya Island, Langesundsfjord, Norway

Field-hunting tip

Where it forms: In serpentinized dolostone associated with W–Sr–B–Be-bearing skarns (Pitkäranta district, Russia); in vugs with natrolite (Saga quarry, Norway). If you start seeing hambergite, schoenfliesite, helvite in float, you are in the right ground. Typical habit: platy crystals, tabular, massive. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify berborite?+

Mohs hardness is 3. Luster: vitreous. The streak is white. Common colors include colorless.

Where is berborite found?+

Notable localities include Luppikko deposit, Pitkäranta district, Lake Ladoga, Karelia, Russia; Saga and Tuften larvikite quarries, Tvedalen, and at Brønnebukta, Siktesøya Island, Langesundsfjord, Norway.

Is berborite safe to handle?+

Berborite contains beryllium. Wash your hands afterwards, never grind or breathe the dust, and store it apart from specimens you handle often.

What minerals are found with berborite?+

Berborite commonly co-occurs with Hambergite, Schoenfliesite, Helvite, Apatite, Cassiterite, Fluorite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does berborite form in?+

Where it forms: In serpentinized dolostone associated with W–Sr–B–Be-bearing skarns (Pitkäranta district, Russia); in vugs with natrolite (Saga quarry, Norway). Working float back to the host body is the standard way to chase a fresh occurrence.

What is berborite used for?+

Berborite is used in collector.

Find berborite on the map

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