GLASS PANE

Glass Pane is the odd one out among the Cartographer's buying offers: everything else he takes off a player, empty maps and compasses, is a tool for exploring, while a stack of panes is just building material. He still pays for it, 11 at apprentice for 1 emerald.

A crafting grid makes 16 panes at once from 6 glass, a wide enough batch that a modest glass stock turns into more panes than most builds need in one pass. Breaking a placed pane needs Silk Touch, ordinary tools shatter it instead of dropping it, the same rule that governs plain glass itself.

Bring 11 glass panes to a Cartographer who has reached Apprentice, and he pays 1 emerald back. No other villager profession touches glass pane at any tier, buying or selling.

The best rate any villager offers is an emerald per 11 glass panes, from the Cartographer, and 1 of the other 2 pays out faster. No villager sells glass pane back, so it is emeralds out and nothing in.

One slot at the Cartographer takes 11 glass panes a trade, 12 trades, 12 emeralds. 8 of the 72 villagers that pay emeralds, emptied out:

12 acacia boats against 288 paper for the same 12 emeralds, 24 times the carrying, and the shortest wait is the Fisherman at 7.5 real minutes of shelf, gathering not counted. Glass Pane itself pays 11 an emerald, so 36 of the 72 ask less and 35 ask more.

A cartography table claims any unemployed villager right away, but glass pane is not on the opening shelf. He needs 10 trade experience banked before apprentice unlocks, level 2 of five, a couple of rounds of paper or map sales along the way first.

Once open, the slot takes 11 panes a time, 12 times before it locks, and a villager restocks at most twice a Minecraft day. Selling building material rather than an exploration tool does not change that schedule.

12 sales close the slot, and the wait after that runs 2 real minutes flat, no faster no matter how quickly the trades are clicked through. Two of those refills fit inside one Minecraft day, itself 20 real minutes long.

Worked that hard, one Cartographer clears 264 glass panes for 24 emeralds across a single day, a slower drip than the Mason's raw-material rows since this slot sells fewer per trade.

One trip, one restock: the Cartographer takes 132 glass panes across 12 trades before the slot locks, paying out 12 emeralds total. Crafting a fresh batch from glass costs nothing but a furnace run first.

Where they go back: that Cartographer also sells empty maps, his cheapest offer going the other direction.

Also on the Cartographer's list: village explorer map, compass, swamp explorer map, jungle explorer map, ocean explorer map and trial chambers map.

Six blocks of glass make sixteen panes, so a window built from panes costs a fraction of one built from full blocks. Panes also connect to each other and to walls, which is why they read as a window frame rather than as a wall of ice.

Nothing spawns on them and mobs cannot walk over them cleanly, so a pane floor around a farm keeps the area quiet. Breaking one without Silk Touch gives nothing at all, which is worth remembering before rearranging a finished window.

A pane is thinner than a block, so a wall of them takes almost no space and still stops movement. That makes panes the standard partition in a build where a full block would eat the room.

They connect to each other, to walls and to iron bars, and they take a shape from what is beside them, so a single pane in the open looks like a post and the same pane in a row looks like a window.

Breaking one gives nothing without Silk Touch, the same as the block, so a window is worth building once and leaving alone.