Eveslogite is a rare complex silicate mineral found primarily within the hyper-alkaline environments of the Kola Peninsula. It is typically identified by its fibrous to acicular habit forming delicate radial sprays or felt-like masses in cavities within alkaline pegmatites.

Hardness

Mohs

Luster

Vitreous to silky

Streak

White

Transparency

Translucent

mineralrare

Eveslogite

Hardness: 5
Luster: Vitreous to silky
Streak: White
Transparency: Translucent

No image

Is this eveslogite?

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 eveslogite with a known reference. Eveslogite sits at Mohs 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 to silky.
4
Match the color range
Compare against the expected color range: light brown, yellow brown.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: aggregates, fibrous.

Often found alongside eveslogite

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

All properties

Chemical formula: (Ca,K,Na,Sr,Ba)₄₈(Ti,Nb,Fe,Fe,Mn)₁₂(OH)₁₂Si₄₈O₁₄₄(OH,F,Cl)₁₄
Mohs hardness: 5
Density: 2.85 g/cm³
Colors: Light brown Yellow brown
Streak: White
Luster: Vitreous to silky
Transparency: Translucent
Crystal system: Monoclinic
Crystal habit: Aggregates, fibrous
Cleavage: Perfect {001}; good {010}
Rarity: Rare
Uses: Collector
Host rock: In a veinlet that cuts nepheline syenite in an alkaline massif

Where rockhounds find eveslogite

Classic worldwide localities

Mt. Eveslogchorr, Khibiny alkaline massif, Kola Peninsula, Russia

Field-hunting tip

Where it forms: In a veinlet that cuts nepheline syenite in an alkaline massif. If you start seeing nepheline, k-feldspar, biotite in float, you are in the right ground. Typical habit: aggregates, fibrous. Train your eye for that shape before scanning the outcrop.

Common questions

How do you identify eveslogite?+

Mohs hardness is 5. Luster: vitreous to silky. The streak is white. Common colors include light brown, yellow brown.

Where is eveslogite found?+

Notable localities include Mt. Eveslogchorr, Khibiny alkaline massif, Kola Peninsula, Russia.

What minerals are found with eveslogite?+

Eveslogite commonly co-occurs with Nepheline, K-feldspar, Biotite, Fluorapatite, Shcherbakovite, Eudialyte. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does eveslogite form in?+

Where it forms: In a veinlet that cuts nepheline syenite in an alkaline massif. Working float back to the host body is the standard way to chase a fresh occurrence.

What is eveslogite used for?+

Eveslogite is used in collector.

Find eveslogite on the map

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