Knasibfite is an extremely rare fluoride mineral typically found in highly evolved alkaline pegmatites. It usually forms as small, colorless prismatic crystals and is prized primarily by advanced mineral collectors for its unique chemical composition and scarcity.

Hardness

Mohs

Luster

Vitreous

Streak

White

Transparency

Transparent

mineralrare

Knasibfite

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

No image

Is this knasibfite?

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 knasibfite with a known reference. Knasibfite 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. Knasibfite leaves a white streak.
3
Read the luster
Hold the specimen under a strong light. Knasibfite typically shows a vitreous luster.
4
Match the color range
Compare against the expected color range: colorless, white.
5
Look at form & habit
Crystal system: monoclinic. Typical habit: prismatic crystals.

Often confused with

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

mineral

Cryolite

Mohs 2.5-3

How to tell apart: Luster reads vitreous on Knasibfite and vitreous to greasy on Cryolite.

Often found alongside knasibfite

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

All properties

Chemical formula: K₃Na₃Al₂F₁₂
Mohs hardness: 3
Density: 2.81 g/cm³
Colors: Colorless White
Streak: White
Luster: Vitreous
Transparency: Transparent
Crystal system: Monoclinic
Crystal habit: Prismatic Crystals
Cleavage: Distinct
Rarity: Rare
Uses: Collector
Host rock: Alkaline Pegmatites
Typical price: $50-300 per specimen

Where rockhounds find knasibfite

Classic worldwide localities

Kola Peninsula, Russia

Field-hunting tip

Look in alkaline pegmatites country — that is the host setting where knasibfite typically forms. If you start seeing fluorite, sodalite, microcline in float, you are in the right ground. Field specimens usually show a prismatic crystals habit, so train your eye for that shape before scanning the outcrop.

Common questions

How do you identify knasibfite?+

Mohs hardness is 3. It typically shows a vitreous luster. The streak is white. Common colors include colorless, white.

Where is knasibfite found?+

Notable localities include Kola Peninsula, Russia.

How much is knasibfite 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.

Is knasibfite safe to handle?+

It contains toxic constituents. Contains fluorine; handle with care to avoid inhalation of dust or ingestion. Wash hands thoroughly after handling. Handle with care, avoid grinding or breathing dust, and store separately.

What rocks look like knasibfite?+

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

What minerals are found with knasibfite?+

Knasibfite commonly co-occurs with Fluorite, Sodalite, Microcline, Aegirine. Spotting any of these in float or country rock is a useful trip signal.

What kind of rock does knasibfite form in?+

Knasibfite typically forms in alkaline pegmatites. Working float back to the host body is the standard way to chase a fresh occurrence.

What is knasibfite used for?+

Knasibfite is used in collector.

Find knasibfite on the map

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