NOTE: This article contains spoilers! Read with caution.

Antarcticite / アンタークチサイト

IMG 6291

Antarc 1

First appearance Volume 3, Chapter 15

Episode 7

Status Inactive
Current Location Moon
Nickname Antarc / アンターク
Race Gem
Age Unknown
Hardness 3
Family The other Gems
Occupation Winter Duties
Teammate Phosphophyllite (Former)
Voice Actors
Japanese Mariya Ise
English Alyssa Marek

Antarcticite (アンタークチサイト, Antākuchisaito), also called 'Antarc', is one of the Gems who mainly does patrol duty and some other work specifically in the winter. Due to one of this gem's traits, during most of the year they 'sleep' in liquid form when temperatures are warm. They re-crystallize when the temperature drops during the winter. The colder the temperature, the harder and tougher they become.

They usually patrol with Kongo-sensei while the rest of the Gems enter hibernation though they were paired up with Phosphophyllite for a short period of time when the latter refused to hibernate. During this time, they were taken by the Lunarians at the Shore of Nascency.


Antarc has a white color scheme with tints of blue in their eyes and hair. They wear a white version of the winter uniform, which includes very short pants and a vest over a short-sleeved dress shirt along with a black tie. They wear black curved top-line ankle boots with stiletto heels and short black gloves. They have narrow eyes.

Their hair is styled very short, with their bangs being made of longer strands with one long prominent one being in their face generally. Their hair is parted to their right with side swept bangs.

Unlike the other gems who use an ordinary sword, Antarc's blade is saw-like with sharp teeth for cutting into ice. They also have stiletto heels on their boots to help in this endeavour.


Antarc is a perfectionist who acts like a soldier, marching and speaking with extreme formality, giving them a cold, almost apathetic aura. They are used to working alone, as all the other Gems hibernate during the winter when there is not enough sunlight to feed them and keep them active. Though they become partnered with Phos, they have difficulty working with another Gem and often end up doing most of the work. They are similar to Bort in being very blunt and judgmental, but deep down they are soft and kind. They point out the flaws in Phos, stating that the latter should do more than they can do in order to improve.

They are very fond of Kongo-sensei to the point of breaking their usually formal appearance in order to embrace him in a hug. They do not like to openly show this softer side though, blushing when they requested a hug in the first place, and being extremely embarrassed when caught in the act afterwards.

Character Profiles

Vol. 3:

  • In charge during the winter. Behaves like a soldier and an only child.

Vol. 4:

  • All but the Gem's left foot is on the moon.

Vol. 6:

  • Mostly on the moon now. Might look like this; we can't deny the possibility.


  • Antarcticite 'wakes up' and initially scheduled to work alone until it's quickly discovered that Phosphophyllite is still awake and wishes to work. They start to work together, much to Antarcticite's dismay.
  • Antarc teaches Phos tasks required to do during winter, such as breaking ice floes that made the loud screaming noises that could disturb the Gem's sleep. This repeats with Antarc eventually warming up to Phos and bonds with them, remarking how lower hardness Gems need to stick together.
  • Antarc attempts to retrieve Phos's arms when they broke into the icy waters. They are unsuccessful and blame themselves to Sensei when expressing this to him.
  • Took Phos to the Shore of Nascency. They used some gold and platinum alloy to replace Phos' arms. The Lunarians show up, and they successfully destroy one of the "new models" as Phos is left immobilized by the new arms.
  • After destroying the new model, Antarcticite is caught off guard as another Lunarian vessel shows up right after the first and attacks, shattering Antarcticite. Antarcticite motions to Phos to keep quiet and whispers to take care of winter for them and make sure Sensei isn't lonely. Antarcticite is then taken to the Moon, except for the left foot.


Due to the fact that Antarcticite is usually the only Gem active during the winter other than Kongo, it is likely that they have not much interactions with the other Gems. One of their duties is to ensure that the other Gems sleep peacefully, and that includes putting sleep-walking Gems back to rest. Phos managed to stay awake during winter to help out Antarc, so it could be assumed that at some point in the past, other Gems may have done so as well. The Gems are also known to fall into hibernation later or wake up earlier than each other, which may also imply that some of them have interacted with Antarc during that small window of time.

Nonetheless, Antarc seems to be fairly familiar with the other Gems. They knew enough about Phos to agree with the others that Phos never did anything useful. Antarc initially did not want to partner with Phos, preferring to work alone. But after partnering with Phos, they started advising them and teaching them many things in order to get Phos to improve. When Phos fell into the water and lost their arms, Antarc showed grievous concern and immediately jumped into the sea to look for them.

Antarc's affection for Kongo-sensei is one of their defining attributes. When a new type of Lunarians attacked and managed to break off their hand, Antarc became enraged, unwilling to part with any of their memories of Kongo. Before they were abducted by a second party of Lunarians, their last words to Phos is to keep Kongo-sensei company so that he would not be lonely during the winter.

Despite their brief time together, Phos got very attached to Antarc and was traumatized by their abduction; hallucinating and having nightmares about them being shattered to pieces. To them, Antarcticite was a kind and brave senior who was the catalyst for their change from a childish Gem into a very strong and competent one. Whenever Phos needs to make a difficult decision, they think of Antarc and what they would have said.


"We low-hardness Gems have nothing if not our courage." - Antarcticite, after repairing Phos.

"Make sure Sensei isn't lonely, take care of the Winter."- Antarcticite, after being shattered by the Lunarians.

Gem Info

  • Mineral: Halide
  • Chemistry: CaCl2·6H2O
  • Color: Colorless

Antarcticite is an uncommon calcium chloride hexahydrate mineral. It forms colorless acicular trigonalcrystals. It is hygroscopic and has a low specific gravity of 1.715. As its name implies, it was first described in 1965 for an occurrence in Antarctica where it occurs as crystalline precipitate from a highly saline brine in Don Juan Pond, in the west end of Wright Valley, Victoria Land.

Antarcticite is temperature sensitive, very deliquescent and the specimen is displayed in a sealed vial. At temperatures above room-temperature, antarcticite begins to dissolve in its own liquid and re-crystallizes when the temperature drops to room-temperature or below.

Source:Oso's Mineral Co.



  • At the end of the episode in which Antarc is taken by the Lunarians, a special ending theme is played instead of the usual one: "liquescimus" ("melt" in latin) by Tomoyo Kurosawa. Rather than the usual ending video, a still of Antarc's now-empty bathtub is shown.
  • It is possible that the mineral that Antarc actually is is "ice", as it is considered a mineral. Antarcticite doesn't melt and can also be found in California. However, ice does melt in warmer temperatures and the colder it is, the higher hardness ice becomes (which has been briefly mentioned as a characteristic of Antarc).
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