diff --git a/examples/toroid25d.rs b/examples/toroid25d.rs
index 573008f..71a0e79 100644
--- a/examples/toroid25d.rs
+++ b/examples/toroid25d.rs
@@ -1,6 +1,5 @@
 use coremem::{consts, Driver, Flt, mat, meas};
-use coremem::coord::Coord;
-use coremem::geom::{CylinderZ, Vec2};
+use coremem::geom::{Coord, CylinderZ, Vec2};
 
 fn main() {
     coremem::init_logging();
diff --git a/src/driver.rs b/src/driver.rs
index d476069..45bb0ba 100644
--- a/src/driver.rs
+++ b/src/driver.rs
@@ -1,10 +1,9 @@
 use crate::{flt::Flt, mat};
 use crate::consts;
-use crate::coord::Coord;
+use crate::geom::{Coord, Vec3};
 use crate::meas::{self, AbstractMeasurement};
 use crate::render::{self, MultiRenderer, Renderer};
 use crate::sim::{GenericSim as _, SimState};
-use crate::vec::Vec3;
 
 use log::{info, trace};
 use std::path::PathBuf;
diff --git a/src/geom/coord.rs b/src/geom/coord.rs
new file mode 100644
index 0000000..6820cd4
--- /dev/null
+++ b/src/geom/coord.rs
@@ -0,0 +1,42 @@
+use std::fmt::{self, Display};
+
+#[derive(Copy, Clone, Default, Eq, PartialEq)]
+pub struct Coord {
+    y: u32,
+    x: u32,
+    z: u32,
+}
+impl Coord {
+    pub fn new(x: u32, y: u32, z: u32) -> Self {
+        Self {
+            x,
+            y,
+            z,
+        }
+    }
+    pub fn x(&self) -> u32 {
+        self.x
+    }
+    pub fn y(&self) -> u32 {
+        self.y
+    }
+    pub fn z(&self) -> u32 {
+        self.z
+    }
+    /// Convert for use with ndarray indexing
+    pub(crate) fn row_major_idx(&self) -> [usize; 3] {
+        [self.z as _, self.y as _, self.x as _]
+    }
+}
+
+impl From<(u32, u32, u32)> for Coord {
+    fn from((x, y, z): (u32, u32, u32)) -> Self {
+        Self::new(x, y, z)
+    }
+}
+
+impl Display for Coord {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "({}, {}, {})", self.x, self.y, self.z)
+    }
+}
diff --git a/src/geom.rs b/src/geom/mod.rs
similarity index 98%
rename from src/geom.rs
rename to src/geom/mod.rs
index e8ffd78..0463eca 100644
--- a/src/geom.rs
+++ b/src/geom/mod.rs
@@ -1,5 +1,10 @@
+mod coord;
+mod vec;
+
+pub use coord::Coord;
+pub use vec::{Vec2, Vec3};
+
 use crate::flt::{Flt, Real};
-pub use crate::vec::{Vec2, Vec3};
 use std::fmt::{self, Display};
 use std::ops::Add;
 
diff --git a/src/vec.rs b/src/geom/vec.rs
similarity index 99%
rename from src/vec.rs
rename to src/geom/vec.rs
index dc71aac..a234229 100644
--- a/src/vec.rs
+++ b/src/geom/vec.rs
@@ -1,5 +1,5 @@
 use crate::flt::{Flt, Real};
-use crate::coord::Coord;
+use super::Coord;
 use std::convert::From;
 use std::iter::Sum;
 use std::ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Neg, Sub};
diff --git a/src/lib.rs b/src/lib.rs
index c550b53..c45caf3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,14 +7,12 @@
 
 use log::info;
 
-pub mod coord;
 pub mod driver;
 pub mod geom;
 pub mod mat;
 pub mod meas;
 pub mod render;
 pub mod sim;
-pub mod vec;
 
 pub use driver::*;
 pub use mat::*;
diff --git a/src/mat.rs b/src/mat.rs
index e817779..6d9c534 100644
--- a/src/mat.rs
+++ b/src/mat.rs
@@ -1,7 +1,6 @@
 use crate::{CellState, consts};
 use crate::flt::{Flt, Real};
-use crate::geom::{Line2d, Vec2, Polygon2d};
-use crate::vec::Vec3;
+use crate::geom::{Line2d, Vec2, Vec3, Polygon2d};
 use log::{debug, trace};
 use enum_dispatch::enum_dispatch;
 use std::cmp::Ordering;
diff --git a/src/meas.rs b/src/meas.rs
index 5323e63..a3c48be 100644
--- a/src/meas.rs
+++ b/src/meas.rs
@@ -1,6 +1,5 @@
-use crate::coord::Coord;
 use crate::flt::Flt;
-use crate::geom::{Vec3, Region};
+use crate::geom::{Coord, Vec3, Region};
 use crate::mat::Material as _;
 use crate::sim::{Cell, GenericSim};
 use std::fmt::Display;
diff --git a/src/render.rs b/src/render.rs
index 35dcd02..c9b1399 100644
--- a/src/render.rs
+++ b/src/render.rs
@@ -1,9 +1,8 @@
 use ansi_term::Color::RGB;
-use crate::geom::Vec2;
+use crate::geom::{Vec2, Vec3};
 use crate::{flt::{Flt, Real}, Material as _};
 use crate::mat;
 use crate::sim::{Cell, GenericSim};
-use crate::vec::Vec3;
 use crate::meas::AbstractMeasurement;
 use font8x8::{BASIC_FONTS, GREEK_FONTS, UnicodeFonts as _};
 use log::trace;
diff --git a/src/sim.rs b/src/sim.rs
index 9df80d6..804d5f4 100644
--- a/src/sim.rs
+++ b/src/sim.rs
@@ -1,7 +1,6 @@
 use crate::{flt::{Flt, Real}, consts};
-use crate::coord::Coord;
+use crate::geom::{Coord, Vec3};
 use crate::mat::{self, GenericMaterial, Material};
-use crate::vec::Vec3;
 use log::trace;
 
 use ndarray::{Array3, Zip};