Nepskoeite is an extremely rare magnesium chloride hydroxide mineral first discovered in salt deposits in Siberia. It typically occurs as small, delicate tabular crystals in evaporate sequences alongside other saline minerals. Because of its solubility and rarity, it is almost exclusively found in professional research collections rather than private hobbyist collections.

Hardness

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrare

Nepskoeite

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

No image

Is this nepskoeite?

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

Often confused with

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

Often found alongside nepskoeite

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

All properties

Chemical formula: Mg₄Cl(OH)₇·6H₂O
Mohs hardness: 2
Density: 1.77 g/cm³
Colors: White Colorless
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Monoclinic
Crystal habit: Tabular Crystals
Cleavage: Perfect
Rarity: Rare
Uses: Collector
Host rock: Evaporite Deposits
Typical price: n/a

Where rockhounds find nepskoeite

Classic worldwide localities

Nepsko-Botuobinskaya anteclise, Russia

Field-hunting tip

Look in evaporite deposits country — that is the host setting where nepskoeite typically forms. If you start seeing halite, carnallite, sylvite 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 nepskoeite?+

Mohs hardness is 2. It typically shows a vitreous luster. The streak is white. Common colors include white, colorless.

Where is nepskoeite found?+

Notable localities include Nepsko-Botuobinskaya anteclise, Russia.

How much is nepskoeite worth?+

Typical asking prices fall in the range of n/a. Quality, size, and provenance can move individual specimens well outside that range.

What rocks look like nepskoeite?+

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

What minerals are found with nepskoeite?+

Nepskoeite commonly co-occurs with Halite, Carnallite, Sylvite. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does nepskoeite form in?+

Nepskoeite typically forms in evaporite deposits. Working float back to the host body is the standard way to chase a fresh occurrence.

What is nepskoeite used for?+

Nepskoeite is used in collector.

Find nepskoeite on the map

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