Ferronigerite-6N6S is a rare tin-bearing oxide mineral found primarily in granite pegmatites. It usually forms as small, tabular, hexagonal-shaped crystals with a distinctive brown or reddish-brown hue and high hardness.
Is this ferronigerite-6n6s?
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 ferronigerite-6n6s with a known reference. Ferronigerite-6N6S sits at Mohs 8-9 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Ferronigerite-6N6S leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Ferronigerite-6N6S typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: brown, reddish-brown.
- 5Look at form & habitCrystal system: trigonal. Typical habit: tabular crystals.
Often confused with
Ferronigerite-6N6S vs. its common look-alikes — and how to tell them apart in the field.
Often found alongside ferronigerite-6n6s
Minerals reported to co-occur with ferronigerite-6n6s. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- (Fe²⁺,Mg)(Al,Sn)₆O₁₀(OH)₂
- Mohs hardness
- 8-9
- Density
- 4.5-4.6 g/cm³
- Colors
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Trigonal
- Crystal habit
- Tabular Crystals
- Cleavage
- None
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Granite Pegmatites
- Typical price
- $50-300 per specimen
Where rockhounds find ferronigerite-6n6s
Classic worldwide localities
- Nigeria
- Austria
- Sweden
- Finland
Field-hunting tip
Look in granite pegmatites country — that is the host setting where ferronigerite-6n6s typically forms. If you start seeing cassiterite, sillimanite, gahnite in float, you are in the right ground. Field specimens usually show a tabular crystals habit, so train your eye for that shape before scanning the outcrop.
Common questions
How do you identify ferronigerite-6n6s?+
Where is ferronigerite-6n6s found?+
How much is ferronigerite-6n6s worth?+
What rocks look like ferronigerite-6n6s?+
What minerals are found with ferronigerite-6n6s?+
What kind of rock does ferronigerite-6n6s form in?+
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Find ferronigerite-6n6s on the map
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