What number would I put here after the 10 for it to be the same generation chance as diamond?: generateOre(RegidMod.blockLuminiteOre, world, rand, x, z, 1, 10, ?, 0, 100, Blocks.stone);

 

package tntdiamond.RegidMod;

import java.util.Random;

import cpw.mods.fml.common.IWorldGenerator;
import net.minecraft.block.Block;
import net.minecraft.init.Blocks;
import net.minecraft.world.World;
import net.minecraft.world.chunk.IChunkProvider;
import net.minecraft.world.gen.feature.WorldGenMinable;

public class LuminiteGeneration implements IWorldGenerator {

@Override
public void generate(Random random, int chunkX, int chunkZ, World world, IChunkProvider chunkGenerator,
		IChunkProvider chunkProvider) {
	switch (world.provider.dimensionId) {
	case 1:
		generateEnd(world, random, chunkX, chunkZ);
		break;
	case 0:
		generateOverworld(world, random, chunkX, chunkZ);
		break;
	case -1:
		generateNether(world, random, chunkX, chunkZ);
		break;
	}
}

public void generateEnd(World world, Random rand, int x, int z) {
	generateOre(RegidMod.blockLuminiteOre, world, rand, x, z, 0, 0, 5, 0, 100, Blocks.end_stone);
}

public void generateOverworld(World world, Random rand, int x, int z) {
	generateOre(RegidMod.blockLuminiteOre, world, rand, x, z, 1, 10, 5, 0, 100, Blocks.stone);
}

public void generateNether(World world, Random rand, int x, int z) {
	generateOre(RegidMod.blockLuminiteOre, world, rand, x, z, 6, 1, 7, 0, 100, Blocks.netherrack);
}

public void generateOre(Block block, World world, Random random, int chunkX, int chunkZ, int minVienSize, int maxVienSize, int chance, int minY, int maxY, Block generateIn) {
	int vienSize = minVienSize + random.nextInt(maxVienSize - minVienSize);
	int heightRange = maxY - minY;
	WorldGenMinable gen = new WorldGenMinable(block, vienSize, generateIn);
	for (int i = 0; i < chance; i++) {
	int xRand = chunkX * 16 + random.nextInt(16);
	int yRand = random.nextInt(heightRange) + minY;
	int zRand = chunkZ * 16 + random.nextInt(16);
	gen.generate(world, random, xRand, yRand, zRand);
	}
}
}

You should update to 1.10

then check out BiomeDecorator