Ferronigerite-2N1S is a rare tin-bearing oxide mineral belonging to the nigerite group. It typically occurs as small, dark hexagonal plates or tabular crystals in pegmatites and metamorphic environments, often requiring microscopic examination for positive identification.
Is this ferronigerite-2n1s?
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-2n1s with a known reference. Ferronigerite-2N1S 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-2N1S leaves a white streak.
- 3Read the lusterHold the specimen under a strong light. Ferronigerite-2N1S typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: brown, black, yellowish-brown.
- 5Look at form & habitCrystal system: trigonal. Typical habit: tabular crystals, hexagonal plates.
Often confused with
Ferronigerite-2N1S vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Streak differs — Ferronigerite-2N1S leaves white, Gahnite leaves gray.
How to tell apart: Ferronigerite-2N1S is noticeably harder (Mohs 8-9 vs. 5-6.5); streak differs — Ferronigerite-2N1S leaves white, Iron Ore leaves reddish-brown to black; luster reads vitreous on Ferronigerite-2N1S and metallic to submetallic on Iron Ore.
Often found alongside ferronigerite-2n1s
Minerals reported to co-occur with ferronigerite-2n1s. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- (Fe²⁺,Mg,Zn)₂(Al,Sn)₆O₁₁(OH)
- Mohs hardness
- 8-9
- Density
- 4.67 g/cm³
- Streak
- White
- Luster
- Vitreous
- Transparency
- Translucent
- Crystal system
- Trigonal
- Crystal habit
- Tabular Crystals, Hexagonal Plates
- Cleavage
- None
- Rarity
- Rare
- Uses
- Collector
- Host rock
- Tin-bearing Pegmatites, High-grade Metamorphic Rocks
- Typical price
- $50-300 per specimen
Where rockhounds find ferronigerite-2n1s
Classic worldwide localities
- Nigeria
- Finland
- Sweden
- Russia
Field-hunting tip
Look in tin-bearing pegmatites, high-grade metamorphic rocks country — that is the host setting where ferronigerite-2n1s typically forms. If you start seeing cassiterite, sillimanite, mica in float, you are in the right ground. Field specimens usually show a tabular crystals, hexagonal plates habit, so train your eye for that shape before scanning the outcrop.
Common questions
How do you identify ferronigerite-2n1s?+
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What rocks look like ferronigerite-2n1s?+
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Find ferronigerite-2n1s on the map
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