diff --git a/docs/config.rst b/docs/config.rst
index f64a52d01..3d233188b 100644
--- a/docs/config.rst
+++ b/docs/config.rst
@@ -1213,23 +1213,24 @@ StructureOverlay
     a MineralOverlay with alpha support.
 
     This Overlay colors according to a patterns that are specified as
-    multiple tuples of the form ``(relx, rely, relz, blockid)``. So
+    multiple tuples of the form ``(relx, rely, relz, blockid)`` or ``(relx, rely, relz, blockid, data)``. So
     by specifying ``(0, -1, 0, 4)`` the block below the current one has to
-    be a cobblestone.
+    be a cobblestone. By specifying ``(0, -1, 0, 35, 11)`` the block below has to be Blue wool.
 
     One color is then specified as
     ``((relblockid1, relblockid2, ...), (r, g, b, a))`` where the
     ``relblockid*`` are relative coordinates and the blockid as specified
     above. The ``relblockid*`` must match all at the same time for the
-    color to apply.
+    color to apply. The Alpha (a) is optional and is set to 255 by default.
 
     Example::
 
         StructureOverlay(structures=[(((0, 0, 0, 66), (0, -1, 0, 4)), (255, 0, 0, 255)),
-                                     (((0, 0, 0, 27), (0, -1, 0, 4)), (0, 255, 0, 255))])
+                                     (((0, 0, 0, 27), (0, -1, 0, 4)), (0, 255, 0, 255)),
+                                     (((0, 0, 0, 66), (0, -1, 0, 35, 11)), (0, 0, 255))])
 
     In this example all rails(66) on top of cobblestone are rendered in
-    pure red. And all powerrails(27) are rendered in green.
+    pure red, all powerrails(27) are rendered in green and all rails(66) above blue wool are rendered blue.
 
     If ``structures`` is not provided, a default rail coloring is used.
 
diff --git a/overviewer_core/rendermodes.py b/overviewer_core/rendermodes.py
index 7ae67fe3f..1be7ad0d8 100644
--- a/overviewer_core/rendermodes.py
+++ b/overviewer_core/rendermodes.py
@@ -209,7 +209,7 @@ class SlimeOverlay(Overlay):
 class StructureOverlay(Overlay):
     name = "overlay-structure"
     options = {
-        'structures': ('a list of ((((relx, rely, relz), blockid), ...), (r, g, b, a)) tuples for coloring minerals',
+        'structures': ('a list of (((relx, rely, relz, blockid, data), ...), (r, g, b, a)) tuples for coloring minerals',
                        [(((0, 0, 0, 66),  (0, -1, 0, 4)), (255, 0,   0, 255)),
                         (((0, 0, 0, 27),  (0, -1, 0, 4)), (0,   255, 0, 255)),
                         (((0, 0, 0, 28),  (0, -1, 0, 4)), (255, 255, 0, 255)),
diff --git a/overviewer_core/src/primitives/overlay-structure.c b/overviewer_core/src/primitives/overlay-structure.c
index a8561c19d..3a6fbe989 100644
--- a/overviewer_core/src/primitives/overlay-structure.c
+++ b/overviewer_core/src/primitives/overlay-structure.c
@@ -28,6 +28,7 @@ typedef struct {
 struct Condition {
     int32_t relx, rely, relz;
     mc_block_t block;
+    signed short data;
 };
 
 struct Color {
@@ -65,7 +66,10 @@ static void get_color(void* data,
                 all = true;
                 c = (struct Condition*)&structures[col].conditions[cond];
                 // check if the condition does apply and break from the conditions loop if not.
-                if (!(c->block == get_data(state, BLOCKS, x + c->relx, y + c->rely, z + c->relz))) {
+                if (!(
+                        c->block == get_data(state, BLOCKS, x + c->relx, y + c->rely, z + c->relz) &&
+                        (c->data == -1 || (uint32_t)c->data == get_data(state, DATA, x + c->relx, y + c->rely, z + c->relz))
+                )) {
                     all = false;
                     break;
                 }
@@ -147,8 +151,9 @@ static bool overlay_structure_start(void* data, RenderState* state, PyObject* su
                     return true;
                 }
 
+                structures[i].a = 255;
                 // Parse colorpy into a c-struct.
-                if (!PyArg_ParseTuple(colorpy, "bbbb",
+                if (!PyArg_ParseTuple(colorpy, "bbb|b",
                                       &structures[i].r,
                                       &structures[i].g,
                                       &structures[i].b,
@@ -182,11 +187,13 @@ static bool overlay_structure_start(void* data, RenderState* state, PyObject* su
                 // iterate over all the conditions and read them.
                 for (n = 0; n < structures[i].numconds; n++) {
                     PyObject* ccond = PySequence_Fast_GET_ITEM(condspy, n);
-                    if (!PyArg_ParseTuple(ccond, "iiib",
+                    cond[n].data = -1;     // If no data value is given the data value stays at -1
+                    if (!PyArg_ParseTuple(ccond, "iiih|h",
                                           &cond[n].relx,
                                           &cond[n].rely,
                                           &cond[n].relz,
-                                          &cond[n].block)) {
+                                          &cond[n].block,
+                                          &cond[n].data)) {
                         int32_t x = 0;
                         for (x = 0; x < structures_size; x++) {
                             free(structures[x].conditions);