Syenite is a coarse-grained plutonic igneous rock similar to granite but characterized by a lack of or very low quartz content. It is primarily composed of alkali feldspar with subordinate mafic minerals like hornblende or biotite. Collectors should look for its distinctive speckled appearance and interlocking crystalline texture, commonly found in deep-seated intrusive bodies.
Is this 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 syenite with a known reference. Syenite sits at Mohs 6 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Syenite leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Syenite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: gray, pink, white, speckled.
- 5Look at form & habitTypical habit: phaneritic.
Often confused with
Syenite vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside syenite
Minerals reported to co-occur with syenite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Mohs hardness
- 6
- Density
- 2.7-2.9 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Opaque
- Crystal habit
- Phaneritic
- Rarity
- Common
- Uses
- Building Stone, Decorative, Ornamental
- Host rock
- Plutonic Igneous
- Typical price
- $5-20 per rough specimen
Where rockhounds find syenite
1 mapped spotsClassic worldwide localities
- Norway
- Canada
- Germany
- United States
- Egypt
Field-hunting tip
Look in plutonic igneous country — that is the host setting where syenite typically forms. If you start seeing feldspar, biotite, hornblende in float, you are in the right ground. Field specimens usually show a phaneritic 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 syenite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
