Volkovskite is a rare potassium-calcium borate mineral typically found in marine evaporite sequences. Collectors should look for its characteristic clear to white platy crystals, which are often found associated with salt and potash minerals.

Hardness

2-2.5

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrareBorate Group family

Volkovskite

Hardness: 2-2.5
Luster: Vitreous
Streak: White
Transparency: Transparent

Is this volkovskite?

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 volkovskite with a known reference. Volkovskite sits at Mohs 2-2.5, 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, light orange, pink.
5
Look at form & habit
Crystal system: triclinic. Typical habit: platy, tabular crystals or radiating aggregates.

Often confused with

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

mineral

Boracite

Mohs 7-7.5

How to tell apart: Boracite is the harder of the two (Mohs 7-7.5 vs. 2-2.5).

Often found alongside volkovskite

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

All properties

Chemical formula: KCa₄[B₅O₈(OH)]₄[B(OH)₃]₂Cl·4H₂O
Mohs hardness: 2-2.5
Density: 2.27 g/cm³
Colors: Colorless Light orange Pink
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Triclinic
Crystal habit: Platy, tabular crystals or radiating aggregates
Cleavage: Perfect on {010}
Rarity: Rare
Uses: Collector
Host rock: Uncommon in water-insoluble residues from salt domes and potash deposits

Where rockhounds find volkovskite

Classic worldwide localities

Louann Salt Formation, Clarke Co., Alabama, USA
Inder borate deposit, Kazakhstan
Nepskoye potash deposit, eastern Siberia, Russia
Penobsquis and Salt Springs evaporite deposits, near Sussex, New Brunswick, Canada

Field-hunting tip

Where it forms: Uncommon in water-insoluble residues from salt domes and potash deposits. If you start seeing halite, sylvite, hilgardite in float, you are in the right ground. Typical habit: platy, tabular crystals or radiating aggregates. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify volkovskite?+

Mohs hardness is 2-2.5. Luster: vitreous. The streak is white. Common colors include colorless, light orange, pink.

Where is volkovskite found?+

Notable localities include Louann Salt Formation, Clarke Co., Alabama, USA; Inder borate deposit, Kazakhstan; Nepskoye potash deposit, eastern Siberia, Russia; Penobsquis and Salt Springs evaporite deposits, near Sussex, New Brunswick, Canada.

What rocks look like volkovskite?+

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

What minerals are found with volkovskite?+

Volkovskite commonly co-occurs with Halite, Sylvite, Hilgardite, Boracite, Anhydrite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does volkovskite form in?+

Where it forms: Uncommon in water-insoluble residues from salt domes and potash deposits. Working float back to the host body is the standard way to chase a fresh occurrence.

What is volkovskite used for?+

Volkovskite is used in collector.

Find volkovskite on the map

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