Neotocite is an amorphous, manganese-rich silicate mineral that typically forms as a secondary alteration product in manganese deposits. It is easily identified by its dark, often black or brown color and glass-like luster, appearing in massive or botryoidal habit rather than distinct crystals.
Is this neotocite?
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 neotocite with a known reference. Neotocite sits at Mohs 3-4 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Neotocite leaves a brown streak.
- 3Read the lusterHold the specimen under a strong light. Neotocite typically shows a vitreous luster.
- 4Match the color rangeCompare against the expected color range: black, dark brown, reddish-brown.
- 5Look at form & habitTypical habit: amorphous, botryoidal, crusts, massive.
Often confused with
Neotocite vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Romanèchite is the harder of the two (Mohs 5-6 vs. 3-4); streak differs — Neotocite leaves brown, Romanèchite leaves shiny brownish black; luster reads vitreous on Neotocite and submetallic to dull on Romanèchite.
How to tell apart: Streak differs — Neotocite leaves brown, Limonite leaves yellowish-brown; luster reads vitreous on Neotocite and submetallic to earthy on Limonite.
How to tell apart: Rhodonite is the harder of the two (Mohs 5.5-6.5 vs. 3-4); streak differs — Neotocite leaves brown, Rhodonite leaves white.
Often found alongside neotocite
Minerals reported to co-occur with neotocite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- (Mn,Fe)SiO₃·nH₂O
- Mohs hardness
- 3-4
- Density
- 2.7-3.0 g/cm³
- Streak
- Brown
- Luster
- Vitreous
- Transparency
- Opaque
- Crystal habit
- Amorphous, Botryoidal, Crusts, Massive
- Cleavage
- None
- Rarity
- Uncommon
- Uses
- Collector
- Host rock
- Hydrothermal Veins, Manganese Ore Deposits
- Typical price
- $10-50 per specimen
Where rockhounds find neotocite
2 mapped spotsClassic worldwide localities
- Sweden
- Germany
- Czech Republic
- USA
- Japan
Field-hunting tip
Look in hydrothermal veins, manganese ore deposits country — that is the host setting where neotocite typically forms. If you start seeing rhodochrosite, rhodonite, quartz in float, you are in the right ground. Field specimens usually show a amorphous, botryoidal, crusts, massive habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in California — start trip planning there.
Common questions
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Find neotocite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
