Changed it so it doesn't crash

src/main/java/info/jbcs/minecraft/chisel/block/BlockVoidstone.java

@@ -1,10 +1,35 @@
 package info.jbcs.minecraft.chisel.block;
 
+import info.jbcs.minecraft.chisel.api.ICarvable;
+import info.jbcs.minecraft.chisel.carving.CarvableHelper;
+import info.jbcs.minecraft.chisel.carving.CarvableVariation;
+import info.jbcs.minecraft.chisel.client.GeneralChiselClient;
+import info.jbcs.minecraft.chisel.init.ModTabs;
+import info.jbcs.minecraft.chisel.utils.General;
+import net.minecraft.block.Block;
 import net.minecraft.block.material.Material;
+import net.minecraft.client.renderer.texture.IIconRegister;
+import net.minecraft.util.IIcon;
+import net.minecraft.world.World;
 
-public class BlockVoidstone extends BlockMarbleTexturedOre {
-
-    public BlockVoidstone(Material mat, String baseIcon) {
-        super(mat, baseIcon);
+public class BlockVoidstone extends Block implements ICarvable {
+    public BlockVoidstone() {
+        super(Material.rock);
+        carvableHelper = new CarvableHelper();
+        setHardness(5.0F);
+        setResistance(10.0F);
+        setCreativeTab(ModTabs.tabChiselBlocks);
+    }
+    
+    @Override
+    public void randomDisplayTick(World world, int x, int y, int z, Random random)
+    {
+        if(General.rand.nextInt(4) == 0 && world.isRemote)
+            GeneralChiselClient.spawnVoidstoneFX(world, this, x, y, z);
+    }
+    
+    @Override
+    public CarvableVariation getVariation(int metadata) {
+        return carvableHelper.getVariation(metadata);
     }
 }