Nepheline syenite is a silica-deficient, phaneritic plutonic rock composed primarily of alkali feldspar and nepheline. It often appears similar to granite but lacks quartz, making it a key indicator of alkaline magmatic environments. Collectors look for its characteristic speckled appearance and association with rare alkali-rich mineral assemblages.
Is this nepheline syenite?
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 nepheline syenite with a known reference. Nepheline Syenite sits at Mohs 5.5-6 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Nepheline Syenite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Nepheline Syenite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: gray, white, pink, greenish-gray.
- 5Look at form & habitTypical habit: massive.
Often confused with
Nepheline Syenite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside nepheline syenite
Minerals reported to co-occur with nepheline syenite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Mohs hardness
- 5.5-6
- Density
- 2.55-2.65 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Opaque
- Crystal habit
- Massive
- Cleavage
- None
- Rarity
- Common
- Uses
- Industrial, Architectural, Collector
- Host rock
- Plutonic Igneous Complex
- Typical price
- $5-30 for hand specimens
Where rockhounds find nepheline syenite
1 mapped spotsClassic worldwide localities
- Ontario, Canada
- Kola Peninsula, Russia
- Norway
- Arkansas, USA
- Greenland
Field-hunting tip
Look in plutonic igneous complex country — that is the host setting where nepheline syenite typically forms. If you start seeing nepheline, orthoclase, albite in float, you are in the right ground. Field specimens usually show a massive habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Arkansas — start trip planning there.
Common questions
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Find nepheline syenite on the map
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