diff --git a/src/main/java/dev/tilera/auracore/api/ICrystal.java b/src/main/java/dev/tilera/auracore/api/ICrystal.java
index a8bc956..c71d485 100644
--- a/src/main/java/dev/tilera/auracore/api/ICrystal.java
+++ b/src/main/java/dev/tilera/auracore/api/ICrystal.java
@@ -27,4 +27,6 @@ public interface ICrystal {
      */
     void harvestShard(EntityPlayer player);
 
+    boolean canHarvest(EntityPlayer player);
+
 }
diff --git a/src/main/java/dev/tilera/auracore/mixins/MixinTileCrystal.java b/src/main/java/dev/tilera/auracore/mixins/MixinTileCrystal.java
index e0e7919..7bd5632 100644
--- a/src/main/java/dev/tilera/auracore/mixins/MixinTileCrystal.java
+++ b/src/main/java/dev/tilera/auracore/mixins/MixinTileCrystal.java
@@ -119,4 +119,10 @@ public abstract class MixinTileCrystal extends TileThaumcraft implements ICrysta
         worldObj.spawnEntityInWorld(entity);
     }
 
+    @Override
+    public boolean canHarvest(EntityPlayer player) {
+        int md = this.worldObj.getBlockMetadata(this.xCoord, this.yCoord, this.zCoord);
+        return md != 6 && md != 9 && count > 1;
+    }
+
 }