Neptunite has grey skin with dark navy blue stripes on most of her arms. She has off-white unkempt hair Her lower face has off-white lips and a visor covering two sets of eyes. Her bottom eyes have bi-colored red and blue irises with black, rhomboidal pupils. Her top eyes both have two more irises, each bi-colored blue and pink and lacking pupils. The face on her forehead has plump lips and two sets of eye sockets which lack eyes. She has a relatively thin build, other than her large, bi-colored navy and grey abdomen. Her abdomen has four sets of arms, each with an eye, six abdominal eyes of blue, magenta, and green coloration, and one pair of legs. The top of the abdomen has a dark navy star. Her gemstones are embedded in both of her top palms, the center of her back, the center of her face where her nose would otherwise be, her navel, her sternum, the center of her chest, and her forehead, which house Pearl and Peridot's gemstones.
She wears a tri-colored navy V-neck top with pointed dark navy shoulder pads and dark navy gloves on her main set of hands. The top has a lighter navy V, bordered by more navy. She has a black gradient waistband that connects with her abdomen. Her front two sets of abdomen arms wear Ice's armbands, with the second set donning a star. Her only set of actual legs wear dark navy leggings with dark purple boots which are separated by a purple-grey stripe.
As described by GemCrust, Neptunite is a massive force of unstable power, and can only be effective in battle if all of her component Gems work together and focus on the task at hand. Neptunite is also described as a calming deity.
Neptunite is massive and unstable to some degree, she lacks her own individuality, but there are so many Gems that constitute her that she's more like a weapon than an actual Gem. With so many minds roaming around in her head, it's difficult for Neptunite to move at all.
Nepunite possesses standard Gem abilities, bubbling, shapeshifting, fusion, regeneration, agelessness, and superhuman strength/durability.
Thermokinesis: Inherited from Ruby, this allows Neptunite to control her body temperature.
Pyrokinetic Touch: This allows Neptunite to ignite things she touches on fire.
Fire Breath: This ability allows Neptunite to fire a massive beam of fiery energy from her mouth.
Heat Resistance: Inherited from Ruby, this allows Neptunite to remain stable in extreme heats, such as lava.
Future Vision: Inherited from Sapphire, this allows Neptunite to see all forms of the future possible, after seeing the future she must choose the most likely outcome and determine her actions.
Temporary Power Transfer: She can temporarily pass on her future vision ability to others through lip contact.
Levitation: Inherited from several of her component gems, this ability allows Neptunite to hover in the air.
Enhanced Speed: Inherited from Sapphire, this allows Neptunite to move faster than a normal Gem could.
Item Storing: Inherited from Pearl, this allows Neptunite to store items inside her Gemstones.
Photokinesis: Inherited from several of the fusers, this ability allows Neptunite to create holograms and shine lights from her gemstones.
Invisibility: A fusion exclusive ability, this allows her to refract light around her to become invisible.
Electrokinesis: She is able to generate electricity, an ability which stems from Garnet.
Electric Resistance: Neptunite is impervious to electricity, causing her to be unable to be harmed by it, an ability inherited from Garnet.
Electric Jump: Neptunite has Garnet's ability to use her electrokinesis on the offensive to generate electricity and release it on impact with the ground, while the energy then travels to the target. This particular move is long-ranged.
Spin Dash/Comet Charge: Inherited from Jasper and Amethyst, this allows Neptunite to form a ball and speed forward while with an energetic aura.
Hydrokinesis: Inherited from Lapis, this ability allows Neptunite to control water and freeze it.
Flight: Inherited from Lapis, she can summon Lapis' water wings, which allow her to fly.
Water Walking: Inherited from Pearl and Lapis Lazuli, this ability allows Neptunite walk on top of the water.
Ferrokinesis: Inherited from Peridot, this allows Neptunite to control metal.
Healing: Inherited from Rose and ice, this ability lets Neptunite heal beings and gems.
Phytoanimation: She has the ability to grow sentient flora, an ability inherited from Rose.
Speed of Descent Control: Inherited from Rose, this allows Neptunite to control the speed in which she descends.
Cryokinesis: Inherited from Ice, this allows Neptunite to control ice, snow, and frost.
Cryokinetic Animal Creation: Also inherited from Ice, this allows Neptunite to create animals from ice that are under her control.
Crystal Thread Creation: A fusion exclusive power, this allows Neptunite to weave crystalline thread and make webs, somewhat like a spider.
Psionic Screech: A fusion exclusive ability, this allows Neptunite to emit a noise that can disrupt Gems' physical forms.
Short Distance Teleportation: She has the ability to warp short distances, an ability inherited from Galaxite.
Twister Creation: Nepunite has the ability to create small twisters as diversion, an ability inherited from Mixite.
Healing Burst: She is able to unleash incredible bursts of healing energy, a mixture of both Rose Quartz's and Ice's healing powers.
Sleeping Dust: She is able to breathe a purple form of dust that makes who ever to come into contact with it to fall into a deep sleep, an ability inherited from Spurrite.
Solar Wind Breathing: Neptunite is able to breathe solar wind, an ability inherited from Lavendulan.
Force Field Creation: She can charge particles to create force fields, an ability inherited from Lavendulan.
Aurora Creation: An ability inherited from Lavendulan, Neptunite is able to create auroras.
Hydro Mimicry: An ability inherited from Tanzanite, Neptunite can turn parts of her body into water.
Marine Telepathy: An ablity inherited from Blue Abalone, Nepunite can control all marine life using her voice.
Neptunite is a silicate mineral with the formula KNa2Li(Fe2+, Mn2+)2Ti2Si8O24. With increasing manganese it forms a series with mangan-neptunite. Watasumiite is the variety with vanadium replacing the titanium in the formula.
It was first described in 1893 for an occurrence in the Narssârssuk pegmatite of West Greenlands. It is also found within natrolite veins in glaucophane schist within serpentinite in San Benito County, California, US. It also occurs in Mont Saint-Hilaire, Quebec and in the Kola Peninsula of Russia.
The mineral is named for Neptune, Roman god of the sea because of its association with aegirine from Àgir, the Scandinavian sea-god.
The Gemologist Institute of America (GIA) identified an 11.78-carat faceted specimen as neptunite based on Raman spectroscopy.