Tokkoite is a rare potassium-calcium silicate mineral found primarily in the alkaline rocks of the Murun Massif in Siberia. It typically appears as yellowish-brown fibrous or radiating aggregates and is often associated with the mineral tinaksite. Due to its limited distribution, it is highly sought after by systematic mineral collectors.
Is this tokkoite?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch tokkoite with a known reference. Tokkoite sits at Mohs 5-6 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Tokkoite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Tokkoite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: yellow, brown, yellow-brown.
- 5Look at form & habitCrystal system: triclinic. Typical habit: fibrous, massive, radiating clusters.
Often confused with
Tokkoite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside tokkoite
Minerals reported to co-occur with tokkoite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- K₂Ca₄Si₇O₁₇(OH,F)₂
- Mohs hardness
- 5-6
- Density
- 2.9 g/cm³
- Colors
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Triclinic
- Crystal habit
- Fibrous, Massive, Radiating Clusters
- Cleavage
- Perfect
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Alkaline Igneous Rocks
- Typical price
- $20-150 for small specimens
Where rockhounds find tokkoite
Classic worldwide localities
- Tokko River, Murun Massif, Russia
- Chara-Tokko district, Siberia
Field-hunting tip
Look in alkaline igneous rocks country — that is the host setting where tokkoite typically forms. If you start seeing tinaksite, potassian richerite, aegirine in float, you are in the right ground. Field specimens usually show a fibrous, massive, radiating clusters habit, so train your eye for that shape before scanning the outcrop.
Common questions
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Find tokkoite on the map
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