diff --git a/crates/coremem/src/geom/mod.rs b/crates/coremem/src/geom/mod.rs
index 6c0beac..839be23 100644
--- a/crates/coremem/src/geom/mod.rs
+++ b/crates/coremem/src/geom/mod.rs
@@ -2,8 +2,6 @@ mod line;
 mod polygon;
 pub mod region;
 mod units;
-mod vec;
-mod vecu;
 
 pub use line::Line2d;
 pub use polygon::Polygon2d;
@@ -11,6 +9,6 @@ pub use region::{
     Cube, CylinderZ, Dilate, InvertedRegion, Memoize, Region, Sphere, Spiral, SwapXZ, SwapYZ, Torus, Translate, Union, WorldRegion, Wrap
 };
 pub use units::{Coord, Meters, OrdMeters, Index};
-pub use vec::{Vec2, Vec3};
-pub use vecu::Vec3u;
+pub use coremem_types::vec::{Vec2, Vec3};
+pub use coremem_types::vecu::Vec3u;
 
diff --git a/crates/coremem/src/mat/linear.rs b/crates/coremem/src/mat/linear.rs
index 287b2eb..01118d0 100644
--- a/crates/coremem/src/mat/linear.rs
+++ b/crates/coremem/src/mat/linear.rs
@@ -12,11 +12,24 @@ pub struct Conductor<V> {
     pub conductivity: V,
 }
 
-pub type IsomorphicConductor<R> = Conductor<R>;
+pub type IsomorphicConductor<R> = Conductor<(R,)>;
 pub type AnisomorphicConductor<R> = Conductor<Vec3<R>>;
 
-impl<V> Conductor<V> {
+impl<V> IsomorphicConductor<V> {
     pub fn new(conductivity: V) -> Self {
+        Self {
+            conductivity: (conductivity,)
+        }
+    }
+}
+impl<V: Clone> IsomorphicConductor<V> {
+    pub fn iso_conductivity(&self) -> V {
+        self.conductivity.0.clone()
+    }
+}
+
+impl<R> AnisomorphicConductor<R> {
+    pub fn new(conductivity: Vec3<R>) -> Self {
         Self {
             conductivity
         }
@@ -25,7 +38,7 @@ impl<V> Conductor<V> {
 
 impl<R: Real> Into<AnisomorphicConductor<R>> for IsomorphicConductor<R> {
     fn into(self) -> AnisomorphicConductor<R> {
-        AnisomorphicConductor::new(Vec3::uniform(self.conductivity))
+        AnisomorphicConductor::new(Vec3::uniform(self.conductivity.0))
     }
 }
 
@@ -45,7 +58,7 @@ impl<R: Real> Material<R> for AnisomorphicConductor<R> {
 
 impl<R: Real> Material<R> for IsomorphicConductor<R> {
     fn step_parameters_mut<'a>(&'a mut self) -> StepParametersMut<'a, R> {
-        StepParametersMut::default().with_conductivity(Vec3::uniform(self.conductivity))
+        StepParametersMut::default().with_conductivity(Vec3::uniform(self.conductivity.0))
     }
 }
 
diff --git a/crates/coremem/src/mat/mod.rs b/crates/coremem/src/mat/mod.rs
index 9420cd0..7a04431 100644
--- a/crates/coremem/src/mat/mod.rs
+++ b/crates/coremem/src/mat/mod.rs
@@ -132,7 +132,7 @@ impl<R> From<AnisomorphicConductor<R>> for GenericMaterial<R> {
 
 impl<R: Real, V: Real> From<IsomorphicConductor<V>> for GenericMaterial<R> {
     fn from(inner: IsomorphicConductor<V>) -> Self {
-        let iso_r = IsomorphicConductor::new(inner.conductivity.cast::<R>());
+        let iso_r = IsomorphicConductor::new(inner.iso_conductivity().cast::<R>());
         Self::Conductor(iso_r.into())
     }
 }
@@ -208,7 +208,7 @@ impl<R: Real> Material<R> for GenericMaterial<R> {
 // #[enum_dispatch(Material)]
 #[derive(Clone, Serialize, Deserialize)]
 pub enum GenericMaterialNoPml<R> {
-    Conductor(Conductor<R>),
+    Conductor(AnisomorphicConductor<R>),
     LinearMagnet(LinearMagnet<R>),
     MBFerromagnet(MBFerromagnet<R>),
     Ferroxcube3R1(Ferroxcube3R1<R>),
@@ -217,12 +217,12 @@ pub enum GenericMaterialNoPml<R> {
 
 impl<R: Real> Default for GenericMaterialNoPml<R> {
     fn default() -> Self {
-        Conductor::default().into()
+        AnisomorphicConductor::default().into()
     }
 }
 
-impl<R> From<Conductor<R>> for GenericMaterialNoPml<R> {
-    fn from(inner: Conductor<R>) -> Self {
+impl<R> From<AnisomorphicConductor<R>> for GenericMaterialNoPml<R> {
+    fn from(inner: AnisomorphicConductor<R>) -> Self {
         Self::Conductor(inner)
     }
 }
@@ -267,19 +267,19 @@ impl<R: Real> Material<R> for GenericMaterialNoPml<R> {
 // #[enum_dispatch(Material)]
 #[derive(Clone, Serialize, Deserialize)]
 pub enum GenericMaterialOneField<R> {
-    Conductor(Conductor<R>),
+    Conductor(AnisomorphicConductor<R>),
     Ferroxcube3R1(Ferroxcube3R1<R>),
     MinimalSquare(MinimalSquare<R>),
 }
 
 impl<R: Real> Default for GenericMaterialOneField<R> {
     fn default() -> Self {
-        Conductor::default().into()
+        AnisomorphicConductor::default().into()
     }
 }
 
-impl<R> From<Conductor<R>> for GenericMaterialOneField<R> {
-    fn from(inner: Conductor<R>) -> Self {
+impl<R> From<AnisomorphicConductor<R>> for GenericMaterialOneField<R> {
+    fn from(inner: AnisomorphicConductor<R>) -> Self {
         Self::Conductor(inner)
     }
 }
diff --git a/crates/coremem/src/sim/mod.rs b/crates/coremem/src/sim/mod.rs
index d5fe657..961455f 100644
--- a/crates/coremem/src/sim/mod.rs
+++ b/crates/coremem/src/sim/mod.rs
@@ -1066,12 +1066,12 @@ impl<'a, R: Real, M: Material<R>> HCell<'a, R, M> {
                 let aux = &mut pml.aux_h;
                 // (S^-1 \nabla) x E
                 Vec3::from((
-                    aux.sy_conv_dfz_dy.step_only_sigma(e.y, delta_ez_y)
-                        - aux.sz_conv_dfy_dz.step_only_sigma(e.z, delta_ey_z),
-                    aux.sz_conv_dfx_dz.step_only_sigma(e.z, delta_ex_z)
-                        - aux.sx_conv_dfz_dx.step_only_sigma(e.x, delta_ez_x),
-                    aux.sx_conv_dfy_dx.step_only_sigma(e.x, delta_ey_x)
-                        - aux.sy_conv_dfx_dy.step_only_sigma(e.y, delta_ex_y),
+                    aux.sy_conv_dfz_dy.step_only_sigma(e.y(), delta_ez_y)
+                        - aux.sz_conv_dfy_dz.step_only_sigma(e.z(), delta_ey_z),
+                    aux.sz_conv_dfx_dz.step_only_sigma(e.z(), delta_ex_z)
+                        - aux.sx_conv_dfz_dx.step_only_sigma(e.x(), delta_ez_x),
+                    aux.sx_conv_dfy_dx.step_only_sigma(e.x(), delta_ey_x)
+                        - aux.sy_conv_dfx_dy.step_only_sigma(e.y(), delta_ex_y),
                 ))
             }
         };
@@ -1183,12 +1183,12 @@ impl<'a, R: Real, M: Material<R>> ECell<'a, R, M> {
                 let aux = &mut pml.aux_e;
                 // (S^-1 \nabla) x H
                 Vec3::from((
-                    aux.sy_conv_dfz_dy.step_only_sigma(e.y, delta_hz_y)
-                        - aux.sz_conv_dfy_dz.step_only_sigma(e.z, delta_hy_z),
-                    aux.sz_conv_dfx_dz.step_only_sigma(e.z, delta_hx_z)
-                        - aux.sx_conv_dfz_dx.step_only_sigma(e.x, delta_hz_x),
-                    aux.sx_conv_dfy_dx.step_only_sigma(e.x, delta_hy_x)
-                        - aux.sy_conv_dfx_dy.step_only_sigma(e.y, delta_hx_y),
+                    aux.sy_conv_dfz_dy.step_only_sigma(e.y(), delta_hz_y)
+                        - aux.sz_conv_dfy_dz.step_only_sigma(e.z(), delta_hy_z),
+                    aux.sz_conv_dfx_dz.step_only_sigma(e.z(), delta_hx_z)
+                        - aux.sx_conv_dfz_dx.step_only_sigma(e.x(), delta_hz_x),
+                    aux.sx_conv_dfy_dx.step_only_sigma(e.x(), delta_hy_x)
+                        - aux.sy_conv_dfx_dy.step_only_sigma(e.y(), delta_hx_y),
                 ))
             }
         };
diff --git a/crates/coremem/src/sim/spirv/bindings.rs b/crates/coremem/src/sim/spirv/bindings.rs
index b07420f..a707bc7 100644
--- a/crates/coremem/src/sim/spirv/bindings.rs
+++ b/crates/coremem/src/sim/spirv/bindings.rs
@@ -275,7 +275,7 @@ impl<F: IntoLib> IntoLib for ffi::IsoConductorOr<F> {
 impl<M: Default> From<IsomorphicConductor<f32>> for IsoConductorOr<M> {
     fn from(m: IsomorphicConductor<f32>) -> Self {
         IsoConductorOr {
-            value: m.conductivity,
+            value: m.iso_conductivity(),
             mat: Default::default(),
         }
     }
diff --git a/crates/types/src/lib.rs b/crates/types/src/lib.rs
index 69d116d..9d1ea96 100644
--- a/crates/types/src/lib.rs
+++ b/crates/types/src/lib.rs
@@ -1 +1,3 @@
 pub mod real;
+pub mod vec;
+pub mod vecu;
diff --git a/crates/coremem/src/geom/vec.rs b/crates/types/src/vec.rs
similarity index 98%
rename from crates/coremem/src/geom/vec.rs
rename to crates/types/src/vec.rs
index e751a90..9be933a 100644
--- a/crates/coremem/src/geom/vec.rs
+++ b/crates/types/src/vec.rs
@@ -1,11 +1,11 @@
 use crate::real::{Real, ToFloat};
-use super::Vec3u;
+use super::vecu::Vec3u;
 
 use serde::{Serialize, Deserialize};
-use std::convert::From;
-use std::fmt;
-use std::iter::Sum;
-use std::ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Neg, Sub};
+use core::convert::From;
+use core::fmt;
+use core::iter::Sum;
+use core::ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Neg, Sub};
 
 #[derive(Copy, Clone, Debug, Default, Eq, PartialEq, Serialize, Deserialize)]
 pub struct Vec2<R=f32> {
diff --git a/crates/coremem/src/geom/vecu.rs b/crates/types/src/vecu.rs
similarity index 91%
rename from crates/coremem/src/geom/vecu.rs
rename to crates/types/src/vecu.rs
index 19e42ec..94834b8 100644
--- a/crates/coremem/src/geom/vecu.rs
+++ b/crates/types/src/vecu.rs
@@ -1,9 +1,9 @@
-use crate::geom::Vec3;
-use crate::real::Real;
+use super::vec::Vec3;
+use super::real::Real;
 
 use serde::{Serialize, Deserialize};
-use std::fmt::{self, Display};
-use std::ops::{Add, Div, Mul, Sub};
+use core::fmt::{self, Display};
+use core::ops::{Add, Div, Mul, Sub};
 
 #[derive(Copy, Clone, Debug, Default, Hash, Eq, PartialEq, Ord, PartialOrd, Serialize, Deserialize)]
 pub struct Vec3u {
@@ -29,7 +29,7 @@ impl Vec3u {
         self.z
     }
     /// Convert for use with ndarray indexing
-    pub(crate) fn row_major_idx(&self) -> [usize; 3] {
+    pub fn row_major_idx(&self) -> [usize; 3] {
         [self.z as _, self.y as _, self.x as _]
     }