Senkevichite is a rare potassium-sodium-calcium titanium silicate mineral found primarily in alkaline igneous environments. It typically occurs as small platy or tabular crystals within pegmatitic pockets alongside other rare-earth and alkali-rich minerals. Collectors primarily find this mineral in the Khibiny and Lovozero massifs of the Kola Peninsula.
Is this senkevichite?
4-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 senkevichite with a known reference. Senkevichite sits at Mohs 5.5-6, softer than the next harder reference, harder than the previous one.
- 2Read the lusterHold the specimen under a strong light. Luster: vitreous.
- 3Match the color rangeCompare against the expected color range: colorless, white because of cracks.
- 4Look at form & habitCrystal system: triclinic. Typical habit: platy crystals.
Often confused with
Senkevichite vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Senkevichite is noticeably harder (Mohs 5.5-6 vs. 3-4).
How to tell apart: Senkevichite is noticeably harder (Mohs 5.5-6 vs. 3); luster reads vitreous on Senkevichite and submetallic, pearly, greasy on Astrophyllite.
Often found alongside senkevichite
Minerals reported to co-occur with senkevichite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- CsKNaCa₂TiOSi₇O₁₈(OH)
- Mohs hardness
- 5.5-6
- Density
- 3.12 g/cm³
- Colors
- ColorlessWhite because of cracks
- Luster
- Vitreous
- Transparency
- Transparent
- Crystal system
- Triclinic
- Crystal habit
- Platy crystals
- Rarity
- Rare
- Uses
- Collector
- Host rock
- In the moraine of a glacier
Where rockhounds find senkevichite
Classic worldwide localities
- Upper Darai-Piyoz alkaline massif, Alai mountain ridge, Tien-Shan Mountains, northern Tajikistan
Field-hunting tip
Where it forms: In the moraine of a glacier. If you start seeing pectolite, quartz, aegirine in float, you are in the right ground. Typical habit: platy crystals. Train your eye for that shape before scanning the outcrop.
Common questions
How do you identify senkevichite?+
Where is senkevichite found?+
What rocks look like senkevichite?+
What minerals are found with senkevichite?+
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Find senkevichite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
